In this ultimate how to implement guide to ISO 27001 Annex A 8.26 Application security requirements, you will learn directly from an ISO 27001 Lead Auditor:
- The requirement of the control
- The required implementation steps
- The minimum requirement
I am Stuart Barker, the ISO 27001 Lead Auditor and author of the Ultimate ISO 27001 Toolkit.
Using over 30 years of industry experience across hundreds of audits, I’m giving you the exact templates, walkthroughs, and practical examples you need to achieve ISO 27001 certification.
Table of contents
- ISO 27001 Application security requirements Implementation Checklist
- 1. Define Security Requirements in Specifications
- 2. Mandate Authentication Standards
- 3. Specify Input Validation Rules
- 4. Secure Transaction Services
- 5. Enforce Cryptographic Requirements
- 6. Address Supply Chain Risks (SBOM)
- 7. Define Output Sanitisation
- 8. Vet Third-Party (SaaS) Acquisitions
- 9. Identify Legal and Regulatory Constraints
- 10. Formal Security Sign-Off
- ISO 27001 Annex A 8.26 SaaS / GRC Platform Implementation Failure Checklist
Implementing ISO 27001 Annex A 8.26 is the strategic process of defining and formally approving information security requirements before the development or acquisition of applications. This control mandates integrating security specifications into project lifecycles, ensuring software is secure by design. The primary business benefit is preventing costly vulnerabilities and ensuring regulatory compliance from the outset.
ISO 27001 Application security requirements Implementation Checklist
Use this implementation checklist to achieve compliance with ISO 27001 Annex A 8.26. This control mandates that information security requirements are identified, specified, and formally approved before the development or acquisition of applications begins.
1. Define Security Requirements in Specifications
Control Requirement: Security requirements must be explicitly defined alongside functional requirements in the project scope.
Required Implementation Step: Update your project initiation templates (PRDs) or Jira Epic templates to include a mandatory “Non-Functional Security Requirements” section. This must detail specific needs such as “Must support SSO,” “Must encrypt field X,” or “Must log action Y.”
Minimum Requirement: No new software project starts without a documented list of security constraints.
2. Mandate Authentication Standards
Control Requirement: Applications must verify the identity of users to a level of trust appropriate for the data sensitivity.
Required Implementation Step: Specify that all new internal applications must integrate with the corporate Identity Provider (IdP) via OIDC or SAML. For public-facing apps, mandate MFA (Multi-Factor Authentication) for all administrative or financial access roles.
Minimum Requirement: Hardcoded credentials and local user databases are explicitly forbidden in the requirements phase.
3. Specify Input Validation Rules
Control Requirement: The application must sanitise all data inputs to prevent injection attacks.
Required Implementation Step: Write a requirement that all API endpoints and form fields must validate data against a strict “allow-list” (e.g., only alphanumeric characters). Explicitly ban the acceptance of raw HTML or SQL commands in the design document.
Minimum Requirement: The design specification requires the use of a framework that handles auto-escaping.
