Use OWASP Resources for ISO 27001 Application Security Evidence

OWASP resources can make ISO/IEC 27001 application-security controls more actionable, but they do not create automatic conformity. ISO 27001 establishes a risk-based management system; OWASP provides practical, openly available knowledge for designing, building and testing secure software.

Use each resource for the job it is suited to. The OWASP Top 10 is an awareness document, the Application Security Verification Standard (ASVS) supports verifiable security requirements, and the Web Security Testing Guide (WSTG) provides testing approaches. Treating the Top 10 as the entire application-security programme leaves major gaps in governance, design and evidence.

Place OWASP inside the ISMS

Annex A application-security controls work as a chain rather than isolated activities. Depending on risk and applicability, relevant controls include:

• A.8.25, secure development lifecycle;
• A.8.26, application security requirements;
• A.8.27, secure system architecture and engineering principles;
• A.8.28, secure coding;
• A.8.29, security testing in development and acceptance; and
• A.8.8, management of technical vulnerabilities.

OWASP can support methods beneath these controls. It does not decide scope, risk acceptance, accountability or whether a control is necessary. Those decisions remain with the organisation and should be recorded through risk treatment and the Statement of Applicability.

The Annex A control lookup helps view application controls alongside change, access, logging and supplier controls.

Match the resource to the outcome

Resource	Best use	Misuse to avoid
OWASP Top 10	Awareness, executive communication and a starting view of common web-app risks	Treating ten categories as complete requirements or full test coverage
OWASP ASVS	Defining and verifying detailed application-security requirements	Applying every requirement without risk-based tailoring
OWASP WSTG	Planning and performing web security testing	Assuming a test guide replaces secure design and coding
OWASP MASVS	Mobile application security requirements and verification	Using web-only criteria for mobile-specific risks
OWASP Cheat Sheet Series	Focused developer guidance for particular problems	Copying advice without checking architecture and technology context

The current OWASP Top 10 describes widely important web-application risk categories. OWASP itself presents it as an awareness resource. Use it to start conversations, then move to specific, testable requirements.

Begin with application risk tiers

Not every application needs identical assurance. Define tiers using factors such as:

• sensitivity and volume of information;
• internet exposure and user population;
• transaction value or safety impact;
• privileged or administrative function;
• integration with critical services;
• legal and contractual obligations;
• change frequency;
• technology novelty; and
• consequence of compromise or unavailability.

A public marketing site, an employee portal and a payment service should not receive the same controls by default. Risk tiers help determine ASVS depth, review independence, testing frequency and release authority.

Document who assigns the tier, when it changes and how exceptions are approved. Reassess after material architecture, data or exposure changes.

The threat and vulnerability catalogue guide shows how reference material can support risk analysis without replacing scenario-based judgement.

Turn risk into testable requirements

Application-security requirements should be defined before coding and linked to risk, architecture and acceptance.

For each relevant requirement, record:

• identifier and source;
• affected application or component;
• security objective;
• implementation owner;
• verification method;
• required evidence;
• release criterion; and
• exception authority.

ASVS provides a useful catalogue for web-application verification. The official OWASP ASVS guide explains its role in defining a basis for testing technical security controls and secure-development requirements.

Tailor deliberately. Record why a requirement applies, is modified or is outside the application’s context. Tailoring improves relevance when it is risk-based and approved; silent omission weakens assurance.

Connect requirements to architecture

Many application weaknesses originate in design choices that code scanning cannot repair. Include security in architecture and threat modelling.

Review:

• trust boundaries and data flows;
• authentication and session design;
• authorisation at every relevant layer;
• input and output handling;
• tenant isolation;
• secrets and key custody;
• logging and security monitoring;
• dependency and service trust;
• error handling and failure modes; and
• administrative and recovery paths.

Record design decisions and unresolved threats. If a compensating measure is chosen, state the scenario, rationale, owner and evidence. The project-security guide helps integrate such decisions into delivery governance.

Embed secure coding in normal delivery

Policy language such as “developers shall code securely” is not operational. Translate it into engineering practices:

• technology-specific coding rules;
• peer review for security-sensitive changes;
• automated static and dependency analysis;
• controlled secrets;
• protected branches and build pipelines;
• change traceability;
• developer training connected to actual technologies; and
• a process for triaging and correcting findings.

OWASP cheat sheets can support detailed practices, but teams should pin or review their chosen guidance as external content evolves. Internal standards must have an owner and change process.

Measure whether tools influence decisions. A scanner that creates thousands of ignored alerts is not strong evidence. Retain triage, false-positive rationale, remediation, accepted risk and recurrence analysis.

Design layered testing

Testing should reflect application risk, release type and threat model. Combine techniques because no single method finds every weakness:

• automated static analysis;
• software-component and dependency analysis;
• dynamic testing;
• API testing;
• manual code review;
• configuration review;
• threat-driven security tests;
• penetration testing; and
• acceptance tests for defined security requirements.

The OWASP Web Security Testing Guide provides scenarios and techniques for web testing. Select relevant coverage and record exclusions rather than claiming that every test applies.

Define independence based on risk. Routine tests may be performed by the delivery team; a high-impact application or major release may warrant a separate specialist. Independence should strengthen objectivity without disconnecting testers from system context.

Establish release gates and exceptions

A release gate should state what evidence is required and which findings block release. Severity alone may be insufficient. Consider exploitability, affected data, exposure, available mitigations, business criticality and uncertainty.

An exception should include:

• affected requirement and application;
• finding or unmet condition;
• risk scenario and current exposure;
• temporary safeguards;
• owner and approval authority;
• expiry or review date; and
• corrective action or longer-term decision.

Do not allow “accepted by the project” to become permanent. Risk acceptance should follow the organisation’s defined authority and be visible to the ISMS.

Keep evidence through the delivery chain

Useful evidence connects requirement, implementation, verification and decision:

1. risk tier and threat model;
2. approved security requirements;
3. design decisions and reviews;
4. code-change and review records;
5. tool configuration and scan results;
6. test scope, environment and result;
7. defect triage and remediation;
8. release approval or exception; and
9. post-release monitoring and vulnerability response.

Tool output alone lacks context. Evidence should identify application, version, date, scope and responsible person. It should also show whether significant findings were resolved or accepted.

The ISO 27001 readiness checker can help identify whether application-security practice is supported by wider governance and assurance.

Feed operational learning back into development

Secure development does not end at release. Vulnerability reports, incidents, logging, customer findings and threat intelligence should influence requirements and engineering standards.

Define routes for:

• receiving and validating vulnerability reports;
• identifying affected versions and customers;
• prioritising correction;
• deploying and verifying fixes;
• communicating with stakeholders;
• reviewing root causes; and
• updating threat models, tests and coding practices.

A recurring weakness across several applications may indicate a shared architecture, training or pipeline problem. Treat systemic causes, not only individual findings.

Audit by tracing real changes

Select a risk-based sample: a new internet-facing feature, a significant authentication change, a critical dependency update and a release with an exception.

For each sample, ask:

• Was the application tier current?
• Were security requirements defined before implementation?
• Did architecture review address relevant threats?
• Were coding and testing practices applied to the actual change?
• Did findings receive evidence-based decisions?
• Was release authority appropriate?
• Did post-release learning update the process?

Pass: OWASP resources are tailored to application risk, requirements are verifiable, releases retain decision evidence and operating feedback improves the lifecycle.

Partial: Testing is active, but requirements are informal, coverage varies by team or exceptions lack expiry and risk-owner approval.

Fail: The organisation runs a Top 10 scan before audit, cannot show what version or scope was tested and releases unresolved findings without authorised decisions.

Use frameworks without outsourcing judgement

OWASP brings depth and practical language to application security. ISO 27001 supplies the governance, risk, accountability and improvement system around it. Join them through risk tiers, testable requirements, layered verification, owned exceptions and traceable release evidence.

The control relationships were cross-checked against the official ISO/IEC 27002 overview. The mapping and audit approach are original AuditPrepared guidance, not a claim of endorsement by either standards body or community.