ISO 27001 Annex A 5.22 Monitor, Review and Change Management of Supplier Services is a security control that mandates the continuous oversight of third-party performance to ensure compliance with contractual security requirements, ultimately protecting the organization from supply chain vulnerabilities and service delivery failures through systematic governance and review.
In this guide, I will show you exactly how to implement ISO 27001 Annex A 5.22 and ensure you pass your audit. You will get a complete walkthrough of the control, practical implementation examples, and access to the ISO 27001 templates and toolkit that make compliance easy.
I am Stuart Barker, an ISO 27001 Lead Auditor with over 30 years of experience conducting hundreds of audits. I will cut through the jargon to show you exactly what changed in the 2022 update and provide you with plain-English advice to get you certified.
Key Takeaways: ISO 27001 Annex A 5.22 Monitoring, Review, and Change Management of Supplier Services
ISO 27001 Annex A 5.22 requires organizations to regularly monitor, review, and evaluate supplier service delivery. This control ensures that the information security practices agreed upon in your contracts (Annex A 5.20) are actually being followed in reality. In a modern “SaaS-first” business, suppliers are your biggest risk; this “preventive” control ensures that you maintain oversight of their performance, respond to their security incidents, and manage any changes they make to their services without compromising your own security posture.
Core requirements for compliance include:
- Continuous Performance Monitoring: You must track supplier performance against agreed service levels (SLAs). This is typically done through monthly or quarterly service reports and dashboards.
- Regular Security Reviews: Critical suppliers should be evaluated at least annually. This involves verifying they still hold valid certifications (like ISO 27001 or SOC 2) and haven’t experienced major security regressions.
- Supplier Change Management: You must monitor and respond to changes made by the supplier, such as updates to their software, changes in their sub-processors, or shifts in their data hosting locations.
- Incident & Problem Management: Organizations must have a structured way to respond when a supplier has a security breach or a service outage, ensuring that the impact on your business is minimized.
- Audit Rights Execution: If your contract includes a “Right to Audit,” you should periodically exercise it, either through a direct audit or by reviewing the supplier’s third-party assurance reports.
- Centralized Supplier Register: All monitoring activities and review outcomes should be recorded in an up-to-date Supplier Register.
Audit Focus: Auditors will look for “The Oversight Trail”:
- Evidence of Review: “Show me the minutes from your last quarterly review meeting with your critical hosting provider. What security issues were discussed?”
- Assurance Verification: “Show me the current ISO 27001 certificate for your payroll provider. When does it expire, and who is responsible for checking it?”
- Change Impact: “When your CRM provider moved their data storage from the US to the EU, how did you assess the impact on your data privacy compliance?”
Monitoring Metrics Matrix (Audit Prep):
| Metric Type | Critical Focus | Review Frequency | Target “Good” Score | ISO 27001:2022 Control |
|---|---|---|---|---|
| Availability | System Uptime (SLA). | Monthly. | > 99.9% | Annex A 5.22 / 8.14 |
| Responsiveness | Incident Ticket Reply Time. | Quarterly. | < 4 Hours. | Annex A 5.22 / 5.26 |
| Assurance | Valid ISO 27001 / SOC 2 Cert. | Annually. | Valid & In-Scope. | Annex A 5.22 / 5.23 |
| Security | Number of Data Breaches. | Ad-hoc / Continuous. | 0 Reported. | Annex A 5.22 / 5.24 |
Table of contents
- What is ISO 27001 Annex A 5.22?
- Watch the ISO 27001 Annex A 5.22 Tutorial
- ISO 27001 Annex A 5.22 Podcast
- ISO 27001 Annex A 5.22 Implementation Guidance
- How to implement ISO 27001 Annex A 5.22
- Monitoring Metrics Matrix
- ISO 27001 Supplier Register Template
- ISO 27001 Supplier Policy Template
- How to comply
- How to Audit ISO 27001 Annex A 5.22
- How to pass an ISO 27001 Annex A 5.22 audit
- What the auditor will check
- Top 3 ISO 27001 Annex A 5.22 Mistakes People Make and How to Avoid Them
- Applicability of ISO 27001 Annex A 5.22 across different business models.
- Fast Track ISO 27001 Annex A 5.22 Compliance with the ISO 27001 Toolkit
- ISO 27001 Annex A 5.22 Applicable Laws and Related Standards
- ISO 27001 Annex A 5.22 FAQ
- Related ISO 27001 Controls and Further Reading
- ISO 27001 controls and attribute values
Do it Yourself ISO 27001
Our Lead-Auditor verified templates with expert support have a 100% success rate.
What is ISO 27001 Annex A 5.22?
ISO 27001 Annex A 5.22 is ensuring the confidentiality, integrity and availability of your suppliers, their products and their services through monitoring and review.
ISO 27001 Annex A 5.22 Monitor, review and change management of supplier services is an ISO 27001 control that requires an organisation to maintain an agreed level of service and information security in line with legal agreements.
ISO 27001 Annex A 5.22 Purpose
The purpose of ISO 27001 Annex A 5.22 is a preventive control that ensures you maintain an agreed level of information security and service delivery in line with supplier agreements.
ISO 27001 Annex A 5.22 Definition
The ISO 27001 standard defines ISO 27001 Annex A 5.22 as:
The organisation should regularly monitor, review, evaluate and manage change in supplier information security practices and service delivery.
ISO 27001:2022 Annex A 5.22 Monitor, review and change management of supplier services
Watch the ISO 27001 Annex A 5.22 Tutorial
In the video ISO 27001 Monitoring Review Change Management of Supplier Services Explained – ISO27001 Annex A 5.22 I show you how to implement it and how to pass the audit.
ISO 27001 Annex A 5.22 Podcast
In this episode: Lead Auditor Stuart Barker and team do a deep dive into the ISO 27001 Annex A 5.22 Monitor, Review And Change Management Of Supplier Services. The podcast explores what it is, why it is important and the path to compliance.
ISO 27001 Annex A 5.22 Implementation Guidance
As with all the clauses that relate to supplier management we are looking to assign the responsibility to a person or a team with the skills and resources to be able to track that requirements are being met and where not, they are being addressed.
In basic terms it is about making sure that the terms and conditions in legal agreements that relate to information security are being met. It is about managing issues, problems and incidents as the occur and if changes are needed to suppliers that those changes do not adversely impact the business.
You are going to:
- Those service performance levels are going to be monitored, most likely via reports or metrics or dashboards.
- Check and respond to changes made by suppliers such as updates, changes to process, changes to controls
- Where supplier services change to monitor and respond to those
- Keep your eye on the terms and conditions of the agreements and that they are followed
- Ensure those pesky suppliers are evaluated and maintain adequate security
It isn’t really that hard although you can over complicate it very easily. Have agreements in place, make sure they are followed, check them and respond when things go wrong.
We are not teaching people how to do supplier management or change it. What is here is common sense.
I’ve sat in the Auditor’s chair for 20 years. These are the exact tools I use to guarantee a pass.
How to implement ISO 27001 Annex A 5.22
Implementing a robust monitoring and review process for supplier services ensures that security standards remain high throughout the lifecycle of the partnership. Use the following ten steps to establish governance, manage changes, and maintain compliance with ISO 27001 Annex A 5.22.
1. Establish a Supplier Monitoring Framework
- Define the scope of monitoring based on the supplier’s risk classification in your Asset Register.
- Identify specific security requirements, such as encryption standards or data residency, that must be tracked.
- Document the frequency of reviews, ensuring high-risk vendors receive more frequent oversight.
2. Appoint Qualified Service Owners
- Assign a dedicated Service Owner to each supplier to act as the primary point of contact for performance and security.
- Ensure the Service Owner has the technical authority to review audit logs and performance dashboards.
- Formalise accountability by including supplier oversight in the Service Owner’s job description.
3. Formalise Performance Metrics and SLAs
- Integrate specific security KPIs into Service Level Agreements (SLAs) to make security performance a contractual obligation.
- Include metrics for incident response times, system uptime, and vulnerability patching cycles.
- Ensure these metrics are measurable and reportable through automated dashboards where possible.
4. Schedule Periodic Performance Reviews
- Conduct monthly or quarterly meetings with suppliers to review service delivery against agreed targets.
- Document meeting minutes and track any identified “Non-Conformities” through to resolution.
- Review supplier reports, such as SOC2 Type II or ISO 27001 certificates, to verify ongoing compliance.
5. Execute Independent Supplier Audits
- Exercise your “Right to Audit” (ROE) as defined in the contract to conduct on-site or remote security assessments.
- Focus audits on technical controls, such as IAM roles, MFA implementation, and physical data centre security.
- Use a standardised checklist to ensure consistency across different supplier audits.
6. Implement Supplier Incident Management
- Establish a clear communication channel for the supplier to report security breaches or service failures.
- Define the “Rules of Engagement” (ROE) for joint incident response involving third-party systems.
- Log all supplier-related incidents in your central incident management system for trend analysis.
7. Authorise Service Changes via Formal Governance
- Subject any significant changes in supplier service delivery to a formal Change Management process.
- Evaluate the security impact of changes, such as new sub-processors or transitions to different cloud regions.
- Require formal sign-off from the CISO or Risk Owner before a change is implemented in production.
8. Audit Technical Access and IAM Roles
- Review the list of supplier personnel who have administrative or “Privileged” access to your organisational assets.
- Verify that MFA is enforced for all third-party remote access connections.
- Ensure that access is revoked immediately upon the termination of a supplier’s staff member or the contract itself.
9. Update the Supplier Risk Register
- Re-evaluate the risk profile of each supplier at least annually or following a significant security incident.
- Capture changes in the threat landscape, such as new geopolitical risks or supply chain vulnerabilities.
- Report high-level supplier risks to the management board during the annual ISO 27001 Management Review.
10. Maintain Validated Exit Strategies
- Develop a transition plan to ensure that services can be moved or brought in-house without a security vacuum.
- Define the process for the secure return or destruction of organisational data at the end of the contract.
- Test the exit strategy periodically to ensure the organisation remains resilient to supplier failure.
Monitoring Metrics Matrix
| Metric | Description | Frequency | Good Score |
| Uptime (SLA) | Is the service available? | Monthly | > 99.9% |
| Incident Response | How fast do they reply to tickets? | Quarterly | < 4 Hours |
| Security Audits | Do they have a valid ISO 27001 cert? | Annually | Valid / Pass |
| Data Breaches | Have they reported any leaks? | Ad-hoc | 0 |
ISO 27001 Supplier Register Template
The ultimate ISO 27001 Supplier Register Template.
ISO 27001 Supplier Policy Template
The ultimate ISO 27001 Supplier Register Template.
How to comply
To comply with ISO 27001 Annex A 5.22 you are going to implement the ‘how’ to the ‘what’ the control is expecting. In short measure you are going to
- Implement a topic specific policy
- Implement a supplier management process
- Include in your supplier management process supplier acquisition and supplier transfer
- Implement an ISO 27001 supplier register
- Have agreements with all suppliers that cover information security requirements
- Have information security assurances for critical suppliers as a minimum and ideally all relevant suppliers
- Monitor those suppliers
- Respond to adverse incidents in a structured way
How to Audit ISO 27001 Annex A 5.22
Auditing the monitoring, review, and change management of supplier services is a critical component of ISO 27001 compliance. As a Lead Auditor, I look for objective evidence that your organisation is proactively governing third-party relationships rather than simply assuming security is being maintained. Follow these ten steps to conduct a thorough technical audit of Annex A 5.22.
1. Inspect the Supplier Asset Register
- Verify that all third-party service providers are documented within a central Asset Register or Supplier Inventory.
- Confirm that each entry includes a risk classification based on the criticality of the data processed.
- Ensure that an owner is assigned to manage the ongoing security relationship for every high-risk supplier.
2. Scrutinise Service Level Agreements (SLAs)
- Review contractual agreements to ensure they contain specific security performance metrics and right-to-audit clauses.
- Identify defined Key Performance Indicators (KPIs) related to system availability, incident response times, and vulnerability remediation.
- Check for clear definitions regarding the notification periods for security breaches or significant service changes.
3. Validate Performance Monitoring Records
- Examine evidence of periodic service reviews, such as meeting minutes or performance dashboards.
- Verify that the organisation tracks supplier performance against the agreed security KPIs.
- Confirm that any identified service shortfalls or security non-conformities have been logged and tracked through to resolution.
4. Audit Independent Assurance Reports
- Inspect copies of independent audit evidence, such as SOC2 Type II reports, ISO 27001 certificates, or penetration test summaries.
- Validate that the scope of these third-party audits covers the specific services provided to your organisation.
- Check that the organisation has reviewed these reports and assessed any noted “exceptions” for their impact on internal security.
5. Review Service Change Management Logs
- Audit the change management process for instances where supplier services have been modified or updated.
- Verify that a formal risk assessment was conducted prior to the implementation of significant service changes.
- Ensure that changes to sub-processors or data storage locations were authorised by the relevant Information Security Officer.
6. Verify Technical Rules of Engagement (ROE)
- Examine Rules of Engagement (ROE) documents for technical audits or vulnerability scans conducted on supplier systems.
- Confirm that the ROE defines the boundaries of testing, communication protocols, and the handling of sensitive findings.
- Check for evidence that these protocols were followed during the most recent technical assessment.
7. Audit Privileged Access and IAM Roles
- Inspect the Identity and Access Management (IAM) roles assigned to supplier personnel within your infrastructure.
- Verify that the principle of least privilege is applied and that administrative access is restricted to authorised tasks.
- Confirm that a formal review of supplier access rights is conducted at least quarterly to revoke unnecessary permissions.
8. Scrutinise Supplier Incident Logs
- Cross-reference the organisational incident log with notifications received from suppliers regarding security events.
- Validate that incidents involving third-party services were managed according to the internal incident response plan.
- Review Root Cause Analysis (RCA) reports provided by suppliers following major service disruptions or security breaches.
9. Confirm Multi-Factor Authentication (MFA) Compliance
- Audit technical logs to ensure that Multi-Factor Authentication (MFA) is enforced for all remote supplier access.
- Verify that authentication methods meet the organisation’s security standards, such as the use of hardware tokens or authenticator apps.
- Check for evidence of “shadow” or unmanaged accounts used by suppliers that bypass standard MFA protocols.
10. Evaluate Exit Strategy Documentation
- Inspect the documented exit strategies and transition plans for critical suppliers.
- Verify that there are clear procedures for the secure return or certified destruction of organisational data upon contract termination.
- Confirm that the Asset Register is updated to reflect the revocation of all physical and logical access once a service is decommissioned.
The Tools We Use.
100% Audit Success. Zero AI Guesswork.
How to pass an ISO 27001 Annex A 5.22 audit
To pass an audit of ISO 27001 Annex A 5.22 Monitor, review and change management of supplier services you are going to make sure that you have followed the steps above in how to comply.
What the auditor will check
The audit is going to check a number of areas. Lets go through the most common
1. That you have a supplier agreements in place
The auditor is going to check that you have agreements in place with suppliers that cover the information security requirements. It will check that those agreements are in date and cover the products and / or services acquired.
2. That you have an ISO 27001 Supplier Register
You will need an ISO 27001 Supplier Register to record and manage your suppliers. Make sure it is up to date and reflects your reality.
3. Documentation
They are going to look at audit trails and all your documentation and see that is classified and labelled. All the documents that you show them, as a minimum if they are confidential should be labelled as such. Is the document up to date. Has it been reviewed in the last 12 months. Does the version control match.
Top 3 ISO 27001 Annex A 5.22 Mistakes People Make and How to Avoid Them
The top 3 Mistakes People Make For ISO 27001 Annex A 5.22 are
1. You have do not monitor suppliers
Make sure that there are reviews and monitors in place. Perhaps meetings. Perhaps reports. Perhaps dashboards. Be sure to be able to evidence that you review and monitor those suppliers. You will have processes for adverse advents so do not be surprised if you are asked to evidence an adverse event, problem or issue and that you followed your process.
2. You have no assurance they are doing the right thing for information security
Make sure you have done your security assessment and can place your hands on an in date certificate such as an ISO 27001 Certification for assurance they are doing the right thing. It needs to be in date a cover the products and / or services you have acquired and are using form the supplier.
3. Your document and version control is wrong
Keeping your document version control up to date, making sure that version numbers match where used, having a review evidenced in the last 12 months, having documents that have no comments in are all good practices.
Applicability of ISO 27001 Annex A 5.22 across different business models.
| Business Type | Applicability & Interpretation | Examples of Control |
|---|---|---|
| Small Businesses |
Service Availability & Notifications. You cannot force big vendors (Google, Xero) to change, but you must monitor their performance. Compliance focuses on tracking uptime and reviewing “Terms of Service” updates. |
• Status Dashboards: Checking the “Microsoft 365 Health Status” page during outages rather than just waiting. • Policy Updates: Reviewing email notifications regarding “Privacy Policy Updates” from critical SaaS tools to ensure data locations haven’t changed. |
| Tech Startups |
API & Sub-processor Changes. Critical focus on “breaking changes” from infrastructure providers (AWS, Stripe). You must monitor if a vendor changes their sub-processors, which impacts your compliance posture. |
• Automated Alerts: Subscribing to AWS/Heroku “Health Events” via PagerDuty or Slack. • Annual Assurance: Downloading and reviewing the latest SOC 2 Type II report from your hosting provider every 12 months to verify their security controls match your requirements. |
| AI Companies |
Model & Data Policy Integrity. Monitoring suppliers is existential. If an LLM provider changes their “Data Retention Policy” (e.g., switching from zero-retention to training on inputs), you may immediately violate client contracts. |
• ToS Scanning: Using automated tools or legal review to flag changes in API provider terms regarding “Model Training” rights. • Performance Drift: Monitoring inference API uptime and latency to ensure they meet the SLAs you have promised to your own customers. |
Fast Track ISO 27001 Annex A 5.22 Compliance with the ISO 27001 Toolkit
For ISO 27001 Annex A 5.22 (Monitoring, review and change management of supplier services), the requirement is to regularly monitor, review, and evaluate supplier information security practices and service delivery. This ensures that the security levels agreed upon in contracts are actually being maintained throughout the life of the relationship.
| Compliance Factor | SaaS Compliance Platforms | High Table ISO 27001 Toolkit | Audit Evidence Example |
|---|---|---|---|
| Evidence Ownership | Rents access to your review history; if you cancel the subscription, your documented vendor performance and SLA logs vanish. | Permanent Assets: Fully editable Word/Excel Supplier Policies and Registers that you own and host forever. | A localized “Supplier Monitoring Log” showing historical uptime performance and certificate expiry dates. |
| Review Governance | Attempts to “automate” monitoring via generic dashboards that cannot attend QBRs or evaluate vendor ownership changes. | Governance-First: Formalizes your existing relationship management (QBRs, SLA reports) into an auditor-ready framework. | A completed “Monitoring Metrics Matrix” proving that a vendor’s security compliance was verified during a quarterly review. |
| Cost Efficiency | Charges a “Vendor Volume Tax” that scales aggressively based on the number of monitored suppliers or third-party reviews. | One-Off Fee: A single payment covers your monitoring governance for 5 critical vendors or 50. | Allocating budget to higher-tier vendor support or security upgrades rather than monthly “SLA dashboard” fees. |
| Strategic Freedom | Mandates rigid review cycles and scoring systems that may not align with your specific industry SLAs or business needs. | 100% Agnostic: Procedures adapt to your workflow—from deep-dive annual audits to simple quarterly metric checks. | The ability to evolve your vendor review strategy (e.g., adding new ESG or security KPIs) without reconfiguring a rigid SaaS module. |
Summary: For Annex A 5.22, the auditor wants to see that you are actively monitoring your suppliers and have a process for managing changes to their services. The High Table ISO 27001 Toolkit provides the governance framework to satisfy this requirement immediately. It is the most direct, cost-effective way to achieve compliance using permanent documentation that you own and control.
ISO 27001 Annex A 5.22 Applicable Laws and Related Standards
| Standard / Law | Regulatory Requirement and Control Relationship |
|---|---|
| UK Data (Use and Access) Act 2025 | The evolution of UK GDPR. Annex A 5.22 provides the ‘Appropriate Technical and Organisational Measures’ (TOMs) required to monitor third-party processors. It ensures that reduced administrative burdens do not lead to a drop in supplier security thresholds. |
| DORA (Digital Operational Resilience Act) | Annex A 5.22 is the primary mechanism for the ‘Management of ICT Third-Party Risk’ pillar. It satisfies the requirement for financial entities to continuously monitor the performance of critical third-party service providers. |
| NIS2 / UK Cyber Security & Resilience Bill | These laws mandate supply chain security and reporting for Managed Service Providers (MSPs). 5.22 ensures you have the monitoring hooks in place to detect and report supplier incidents within the required legal windows. |
| NIST Cybersecurity Framework (CSF) 2.0 | Maps directly to the ‘Govern’ (GV.SC) and ‘Monitor’ (ID.SC) functions. 5.22 provides the operational review process to validate that supplier performance aligns with the NIST Supply Chain Risk Management (SCRM) strategy. |
| SOC2 (Trust Services Criteria) | Relates to the CC9.0 ‘Risk Management’ and ‘Common Criteria’ for monitoring. Annex A 5.22 activities provide the audit trail (meeting minutes, audit logs) that SOC2 auditors require to verify vendor management effectiveness. |
| EU AI Act / ISO 42001 (AI SMS) | For organisations using AI suppliers, 5.22 is used to monitor the data quality, bias controls, and drift of third-party AI models. It ensures the ‘Human Oversight’ requirement of the AI Act is met through service reviews. |
| CIRCIA (USA) | The 72-hour reporting mandate for critical infrastructure requires the incident communication channels established in 5.22 to be functional and tested, ensuring supplier-side breaches are reported to CISA on time. |
| EU Product Liability Directive (PLD) Update | As liability extends to software providers for flaws, 5.22 serves as your ‘due diligence’ record. It proves you actively monitored for vulnerabilities and demanded patches from your software suppliers. |
| ECCF (European Cybersecurity Certification Framework) | Annex A 5.22 is the process used to verify that a supplier’s EU-wide security labels (e.g., EUCS for Cloud) remain valid and that any changes to their service do not invalidate their certification. |
| HIPAA (Health Insurance Portability and Accountability Act) | Applies to ‘Business Associate Agreements’ (BAAs). 5.22 provides the periodic audit of health data access by suppliers to ensure ongoing compliance with the HIPAA Security Rule. |
| CCPA / CPRA (California Data Laws) | Relates to the monitoring of ‘Service Providers’ and ‘Contractors’. 5.22 ensures that suppliers are not selling personal data and are adhering to the restricted data processing instructions provided by the business. |
The Missing Links in Your Supplier Governance
If you think just having a signed contract and an annual check of an ISO 27001 certificate is enough to pass an audit for Annex A 5.22, you are in for a very uncomfortable conversation with your auditor. While the basics cover the ‘what’, most organisations fail because they lack the ‘how’ regarding the continuous, messy reality of supplier relationships. In 2026, with the sheer volume of supply chain attacks, auditors are looking for far more than a tick-box exercise.
Below is exactly what is missing from standard implementations and how you close those gaps to ensure your oversight trail is bulletproof.
1. The Supplier Change Trigger List
Annex A 5.22 isn’t just about watching software version updates. You must monitor the stability and ownership of the supplier itself. I have seen many companies pass their initial audit only to fail their surveillance because a critical SaaS provider was bought by a firm in a high-risk jurisdiction and nobody noticed. You need a formal list of triggers that force an immediate, out-of-band security review:
- Ownership and M&A Activity: Mergers or acquisitions that could change the supplier’s risk profile or data residency.
- Financial Instability: Evidence of layoffs or ‘going concern’ warnings which directly impact service continuity.
- Key Personnel Turnover: The departure of their CISO or DPO is a leading indicator of declining security posture.
- Legal Action: New lawsuits or regulatory fines (such as GDPR or NIS2 breaches) levied against the supplier.
2. Integrating Threat Intelligence (Annex A 5.7)
You cannot rely solely on what a supplier tells you in their quarterly report. Auditors now expect to see negative monitoring. This means you are actively looking for what the supplier might be hiding or hasn’t discovered yet. You should be cross-referencing your supplier list against:
- OSINT and Breach Sites: Checking if your suppliers’ credentials or data are appearing on breach notification platforms.
- Security Rating Platforms: Using tools to get an outside-in view of their technical hygiene.
- Vulnerability Disclosure: Monitoring if they have a clear process for researchers to report bugs and how fast they patch them.
3. Managing ‘Fourth-Party’ and Concentration Risk
Your risk doesn’t stop at your supplier; it extends to their suppliers. If all your ‘diverse’ SaaS vendors actually host their data in the same AWS region, you don’t have resilience, you have a single point of failure. Your monitoring process must include a periodic review of the supplier’s sub-processor list. If they move from a Tier 1 provider to a cheaper, less secure hosting firm, Annex A 5.22 requires you to assess that impact before the change is finalised.
4. The Link to Clause 10 (Improvement)
Monitoring is a waste of time if it doesn’t lead to action. An auditor will look for the bridge between a failed SLA in a quarterly review and your Non-conformity and Corrective Action log. If a supplier fails a security KPI and you don’t log it as a formal issue within your ISMS, you are failing the ‘Review’ and ‘Evaluate’ requirements of this control. You must prove that when monitoring finds a gap, your business takes a risk-based decision to remediate, accept, or terminate.
5. The Standard Security Review Agenda
To provide evidence of ‘The Oversight Trail’, stop having informal chats. Every critical supplier review should follow this standard 5-point agenda to satisfy an auditor:
- Previous Actions: Reviewing the status of security gaps identified in the last meeting.
- Performance vs KPIs: Reviewing uptime, incident response times, and patching cycles.
- Security Incident Review: Discussing any breaches or ‘near misses’ on either side.
- Future Changes: Discussing the supplier’s roadmap and any changes to sub-processors or data locations.
- Assurance Renewal: Verifying that their ISO 27001 or SOC2 certificates remain valid and in-scope.
Technical Proof of Least Privilege
You can monitor company performance all you want, but are you monitoring the actual access they have to your systems? This is a massive audit fail waiting to happen. You need to show that you are regularly reviewing the identity and access management roles assigned to supplier staff. I want to see that when a supplier consultant leaves their firm, their account in your environment is disabled within 24 hours. If you are not auditing the joiners, movers, and leavers of your suppliers, you are not compliant with the spirit of Annex A 5.22.
The Right to Audit Execution Plan
Almost every contract has a Right to Audit clause as required by Annex A 5.20, but almost nobody ever uses it. An auditor is going to ask when was the last time you actually exercised this right. You do not necessarily have to fly to their data centre, but you do need a tiered audit plan. This means you have a documented process for when you will accept a SOC 2 report and when you will demand a deeper technical deep dive or a third party penetration test of the specific service they provide to you.
Supplier Security Drift Monitoring
This is a critical gap for 2026. Suppliers change their default configurations all the time. A minor update to a SaaS platform can suddenly disable a security feature or change a privacy setting without you being notified. You need to mention configuration drift monitoring. This involves using automated tools to ensure that the security posture you agreed upon on day one has not degraded over time due to the supplier internal change management processes.
Data Return and Destruction Verification
Monitoring does not stop while the contract is active. It also covers the exit phase. If you terminate a supplier, how do you monitor and review that they have actually deleted your data? Just taking their word for it is not enough for a Lead Auditor. You should be looking for a formal certificate of data destruction or a final audit report that confirms your intellectual property has been scrubbed from their backups and sub processors.
Communicating Supplier Risks to the Board
Finally, your content needs to bridge the gap between the Supplier Register and the Management Review required by Clause 9.3. The output of your Annex A 5.22 monitoring activities must be a top five supplier risk report that goes to your leadership team. If your most critical supplier has had three major outages in six months and the board does not know about it, your governance framework is broken.
Testing Supplier Incident Response via Tabletops
Monitoring performance is one thing, but knowing how you will react when a supplier actually disappears or gets breached is another. Annex A 5.22 is inextricably linked to your incident management and business continuity plans. I look for evidence that you have conducted a Supplier Tabletop Exercise. This involves sitting your team down and running a simulation where a critical SaaS provider goes offline for 48 hours. If your only plan is to wait for them to fix it, you have failed the evaluation part of this control. You must demonstrate that you have tested your own internal response to a third party failure.
Discovering Shadow Suppliers and Monitoring the Perimeter
You cannot monitor what you do not know about. One of the biggest holes in a Supplier Register is Shadow IT, where departments buy software on a credit card without telling the security team. To satisfy an auditor, you should show that you are monitoring your own perimeter to discover unmanaged suppliers. This might involve reviewing financial expense logs for software subscriptions or using cloud access security broker tools to see where your data is actually going. A truly compliant organisation has a process to catch these rogue suppliers and bring them under the governance of the Annex A 5.22 review cycle.
Dynamic Risk Re-evaluation and Tiering
Most companies tier their suppliers once at the start of the contract and then never look at the risk level again. This is a mistake. Risk is dynamic. If a low risk supplier who originally only had access to your public website suddenly gains access to your customer database, their monitoring frequency must increase immediately. You need to show that your Supplier Risk Register is not a static document but is updated whenever the scope of the service changes. Auditors love to see a trigger that automatically moves a vendor from an annual review to a quarterly review based on their evolving access to your data.
Software Bill of Materials SBOM Monitoring
In 2026, we are looking much deeper than just the supplier company name. We are looking at the Software Bill of Materials. If a supplier provides you with software, Annex A 5.22 requires you to have a level of oversight regarding the components within that software. If a major vulnerability like Log4j hits again, how long does it take you to find out if your suppliers are affected? You should be demanding SBOMs from critical software vendors and monitoring those components for vulnerabilities. This turns your monitoring from a high level business check into a granular technical defence.
The Legal to Technical Communication Bridge
There is often a massive disconnect between the legal team who writes the contract and the technical team who monitors the service. I often find that the service owner responsible for the quarterly review has never actually read the security requirements in the contract. To pass your audit, you should ensure that your service owners have a summary of the key contractual obligations they are supposed to be checking. Evidence of this bridge, such as a briefing note or a simplified checklist for the service owner, proves that your monitoring is actually based on your legal agreements rather than just guesswork.
Monitoring AI Model Drift and Performance Decay
In a standard SaaS environment, if the software is running, it is usually working. With AI, the model can be “up” but technically “broken” due to model drift. This happens when the statistical properties of the input data change, causing the AI to provide inaccurate or biased results. To comply with the “evaluate” requirement of Annex A 5.22, you must monitor for drift. I want to see that you are checking the accuracy and reliability of the supplier’s outputs. If your AI credit scoring provider starts hallucinating or drifting, that is a service delivery failure that must be logged and addressed as a security incident.
Terms of Service Changes and Data Training Rights
The biggest “change management” risk with AI suppliers is the quiet update to their Terms of Service. Many providers are aggressively changing their policies to allow them to train their future models on your data. This is a massive confidentiality risk that bypasses your original risk assessment. Your monitoring process must include a “ToS scan” specifically looking for changes in data usage rights. If a supplier changes their policy from “zero retention” to “opt-out training”, that should trigger an immediate change impact assessment under Annex A 5.22 before any more data is sent to their API.
The AI Supply Chain and Sub-processor Transparency
AI models have a deep and often hidden supply chain including data annotation services, compute providers, and base model creators. Most organisations do not know who their AI supplier’s sub-processors are. In 2026, auditors expect you to monitor the “fourth-party” risk. If your primary AI supplier switches their underlying hosting from a secure UK region to a less regulated jurisdiction to save on GPU costs, you have a compliance drift. You must demand transparency on the AI stack and monitor for any changes in the sub-tier that could invalidate your data protection impact assessments.
Algorithmic Transparency and Explainability Reviews
Monitoring is not just about uptime; it is about “fitness for purpose”. If you use an AI supplier for automated decision making, you have a legal and security obligation to understand how those decisions are made. Your periodic reviews should include a check on the supplier’s “explainability” features. If the supplier updates their model and it becomes a “black box” that can no longer explain its reasoning, you may be in breach of the EU AI Act or the UK Data Act. You need to evidence that you have evaluated these transparency changes as part of your service review meetings.
Integrated AI Risk Governance and ISO 42001 Synergy
Finally, you need to acknowledge that Annex A 5.22 now has a “big brother” in the form of ISO 42001 (the AI Management System standard). In 2026, I expect to see your supplier monitoring integrated with your AI risk management framework. This means your Supplier Register should flag “AI-specific” risks such as prompt injection vulnerabilities or data poisoning. If you are monitoring a supplier that provides a “Large Language Model”, your review should verify their specific AI security controls, not just their office’s physical security. You are not just monitoring a supplier; you are monitoring a dynamic, evolving system.
Climate Action and Infrastructure Resilience
In 2024, ISO published Amendment 1 to the 2022 standard, which is now a mandatory consideration for every audit in 2026. This amendment to Clause 4.1 requires you to determine whether climate change is a relevant issue for your ISMS. Regarding Annex A 5.22, this means your supplier monitoring must include environmental resilience. If your primary data centre is in a region prone to extreme weather or flooding, and you have not reviewed their climate adaptation plan, you have a gap. You must evidence that your critical suppliers are factoring environmental shifts into their long term availability and service delivery targets.
Geopolitical Risk and Sanctions Monitoring
The world is far more fragmented than it was when the 2013 standard was written. In 2026, you cannot ignore where your suppliers are located or who owns them. A truly robust monitoring process includes checking for geopolitical volatility. This means your quarterly reviews should track whether a supplier has become subject to new international sanctions or if their home country is entering a period of significant instability. If a key software provider is based in a territory that suddenly becomes a high risk for state based cyber activity, Annex A 5.22 requires you to evaluate that risk and manage the potential change in service delivery before it impacts your data.
The Shift to Digital Evidence and Real Time Dashboards
The era of showing an auditor a dusty pile of paper folders is over. In 2026, auditors expect to see digital evidence that is integrated into your daily operations. This means using real time dashboards for uptime monitoring and automated logs for ticket response times. If you are still manually typing data from a supplier email into a spreadsheet once a year, you are not really monitoring; you are just archiving history. I want to see a live connection between your supplier performance and your management reporting. This demonstrates that your oversight is continuous rather than a performative act for the audit season.
ESG and Ethical Supply Chain Oversight
While ISO 27001 is focused on information security, the modern regulatory landscape has pulled Environmental, Social, and Governance (ESG) factors into the security conversation. Ethics and security are now linked. A supplier with poor labour practices or a complete lack of ethical transparency is a supplier that is more likely to experience internal fraud, insider threats, or sudden regulatory shutdown. Your monitoring should include a check on the supplier’s ethical standing and their compliance with modern slavery and human rights legislation. This isn’t just about being a good corporate citizen; it is about reducing the risk of sudden, catastrophic service failure.
Financial Health and Interest Rate Sensitivity
Economic volatility and shifting interest rates can kill a supplier faster than a hacker can. As part of your evaluation process under Annex A 5.22, you should be monitoring the financial health of your critical “Tier 1” partners. If a supplier is struggling with debt or facing a sudden demand slowdown, their investment in security controls and personnel will be the first thing to be cut. I look for evidence that you are reviewing public financial filings or using credit monitoring services for your most vital suppliers. If their credit score drops, that should trigger an immediate “out of cycle” review to ensure their security posture remains intact.
The Circular Governance Loop
Finally, the content must emphasize that Annex A 5.22 is a circular process. It starts with the Supplier Map, moves to Live Monitoring, leads to a Triggered Review, results in a Managed Change, and then feeds back into the Monitoring phase. This loop is the heart of a mature ISMS. It ensures that lessons learned from a supplier incident today are used to improve the security requirements for the next supplier you onboard. If your monitoring doesn’t result in improvements to your policies and contracts, you are missing the entire point of the standard.
ISO 27001 Annex A 5.22 FAQ
As a Lead Auditor, I frequently encounter organisations that struggle with the operational side of supplier governance. These FAQs address the most common technical and regulatory hurdles found during ISO 27001 Annex A 5.22 assessments in 2026.
What is ISO 27001 Annex A 5.22?
ISO 27001 Annex A 5.22 is a management control requiring organisations to monitor, review, and manage changes in supplier service delivery. It ensures that security remains consistent throughout the contract lifecycle, mandating that 100% of critical suppliers are subject to regular performance audits and formal change impact assessments.
How often should supplier security reviews occur?
High-risk suppliers must be reviewed at least annually, though critical cloud or managed service providers (MSPs) often require quarterly reviews to satisfy NIS2 and DORA requirements. Low-risk vendors may be reviewed every 2 to 3 years. The frequency should be documented in your Supplier Risk Register and based on the criticality of the data being processed.
What evidence do auditors look for in Annex A 5.22?
Auditors require objective evidence of oversight, specifically:
- Signed minutes from service review meetings and performance dashboards.
- Updated Supplier Risk Registers reflecting recent audit findings or security incidents.
- Formal change requests for significant service modifications, such as shifts in data residency or sub-processor changes.
- Independent assurance reports like SOC2 Type II or ISO 27001 certificates.
How does Annex A 5.22 relate to DORA and NIS2?
Annex A 5.22 provides the operational framework for the ‘Management of ICT Third-Party Risk’ required by DORA and the supply chain security mandates in NIS2. Implementing this control ensures you have the monitoring hooks and reporting channels necessary to meet the 72-hour incident notification windows required by the UK Cyber Security and Resilience Bill.
What is the role of change management in supplier services?
Change management in 5.22 ensures that any modification to a supplier’s service, such as a platform upgrade or a new data processing location—is risk-assessed before implementation. Failure to manage these changes can lead to ‘compliance drift,’ where a previously secure service no longer meets your organisational security standards or legal obligations like the UK Data (Use and Access) Act 2025.
Related ISO 27001 Controls and Further Reading
| Related ISO 27001 Control | Audit Context and Relationship |
|---|---|
| ISO 27001 Annex A 5.19 Information Security in Supplier Relationships | This is the parent control for all vendor management. While 5.19 sets the policy and rules for engagement, 5.22 is the operational mechanism that proves those rules are being followed through active monitoring. |
| ISO 27001 Annex A 5.20 Addressing Information Security within Supplier Agreements | You cannot monitor what you have not contracted. 5.20 provides the legal “Right to Audit” and the Service Level Agreements (SLAs) that 5.22 subsequently measures and verifies during the review process. |
| ISO 27001 Annex A 5.21 Managing Information Security in the ICT Supply Chain | This control focuses on the complexity of sub-processors and hardware vendors. 5.22 provides the governance layer to ensure that any changes in the ICT supply chain are captured and risk-assessed before they impact your security posture. |
| ISO 27001 Annex A 5.23 Information Security for Use of Cloud Services | Cloud providers are your most critical suppliers. The monitoring requirements in 5.22 are applied specifically here to track cloud configuration changes and ensure the provider maintains their compliance certifications. |
| ISO 27001 Annex A 8.32 Change Management | Control 5.22 specifically addresses supplier-side changes, but these must feed into your internal 8.32 Change Management process. An auditor will check that a supplier’s system update is treated with the same rigour as an internal code deployment. |
| ISO 27001 Annex A Controls List | This is the central directory for all 93 controls. It provides the necessary structural context for AI parsers to understand where 5.22 sits within the broader Annex A framework and the 2022 standard update. |
| ISO 27001 Toolkit | The toolkit provides the physical evidence for 5.22, including the Supplier Risk Register and the Audit Schedule. It is the practical implementation layer that turns the requirements of this control into auditable records. |
| ISO 27001 Annex A 5.37 Documented Information | Monitoring and review activities must be recorded to be valid. This control governs how the meeting minutes, audit reports, and change logs produced by 5.22 are stored, protected, and retained for audit purposes. |
ISO 27001 Supplier Security Policy Beginner’s Guide
ISO 27001 controls and attribute values
| Control type | Information security properties | Cybersecurity concepts | Operational capabilities | Security domains |
|---|---|---|---|---|
| Preventive | Confidentiality | Identify | Supplier relationships security | Protection |
| Integrity | Governance and ecosystem | |||
| Availability | Defence | |||
| Information security assurance |
About the author
