ISO 27001 A.8.30 - Outsourced Development

Requirement

“The organization shall direct, monitor and review the activities related to outsourced system development.”

Plain-language meaning

If a supplier builds software or systems for the organization, the organization still owns the security outcome. Outsourcing the work does not outsource accountability.

The organization should define what the supplier must do, how security requirements are communicated, how development activity is monitored, how deliverables are checked, and how supplier performance is reviewed.

Why this matters

Outsourced development creates visibility and control gaps. Poor supplier practices can introduce insecure code, hidden functionality, weak dependencies, intellectual property problems, unauthorized access, and unmanaged supply chain risk.

This control is especially important where a supplier develops business-critical applications, customer-facing systems, integrations, cloud services, or software that processes sensitive information.

Implementation guidance

1. Identify outsourced development scope

Maintain a clear list of suppliers, contracts, systems, repositories, environments, data access, and deliverables involved in outsourced development.

2. Assess supplier development risk

Assess risks before and during the engagement. Consider sensitivity of information, criticality of the system, supplier access, subcontracting, geographic/legal exposure, use of open-source or third-party components, and supply chain dependencies.

3. Define security requirements in agreements

Contracts or statements of work should define secure development requirements, code quality expectations, intellectual property ownership, testing requirements, developer training expectations, audit rights, confidentiality, defect remediation, and evidence obligations.

4. Monitor supplier activity

Monitor delivery through security reviews, milestone checks, code review evidence, test results, vulnerability reports, defect closure, access reviews, and supplier meetings.

5. Review deliverables before acceptance

Do not accept outsourced code or systems only because the feature works. Review security testing, code quality, malware checks, hidden functionality risk, dependency risk, open-source licensing, training evidence, and unresolved findings.

6. Manage supplier changes

Changes to security requirements, responsibilities, subcontractors, tools, environments, or delivery practices should be reviewed and reflected in contracts or controlled delivery records.

Audit guidance

Auditors should verify:

• outsourced development activities are identified;
• risks are assessed before and during development;
• contracts define security, quality, IP, testing, audit, and training expectations;
• the organization monitors supplier development activity;
• supplier deliverables are tested and reviewed before acceptance;
• indirect supply chain risks are considered;
• changes to responsibilities, controls, or requirements are contractually or formally controlled;
• unresolved supplier findings are remediated or formally risk-accepted.

Evidence examples

Strong evidence

• Contract clauses match the risk assessment.
• Supplier deliverables have security test and code review evidence.
• Vulnerabilities and quality issues are tracked to closure.
• Audit rights or assurance mechanisms exist and are used where risk justifies them.
• IP rights, open-source use, and ownership are explicitly handled.
• Supplier developer training or competence evidence is available where required.

Weak evidence

• Generic procurement contract with no secure development terms.
• Supplier says “secure coding is followed” without evidence.
• Functional acceptance is used as security acceptance.
• No supplier development risk assessment exists.
• No review of subcontractors or indirect supply chain dependencies.
• Security findings are discussed informally but not tracked.

Common failures

Exam traps

Related controls and concepts

• A.8 Technological Controls MOC
• A.5.19 Information Security in Supplier Relationships
• A.5.20 Addressing Information Security Within Supplier Agreements
• A.5.21 Managing Information Security in the ICT Supply Chain
• A.5.22 Monitoring, Review and Change Management of Supplier Services
• A.8.25 Secure Development Life Cycle
• A.8.26 Application Security Requirements
• A.8.28 Secure Coding
• A.8.29 Security Testing in Development and Acceptance
• Statement of Applicability
• Risk Assessment
• Supplier Security Risk Assessment
• Supplier Security Agreement Requirements Checklist
• A.8.30 Audit Evidence Pack
• A.8.30 Audit Checklist

KB-ready summary

• Identify outsourced development work.
• Assess supplier and supply chain risk.
• Put secure development requirements in contracts.
• Monitor supplier development activities.
• Review test, code, vulnerability, training, and IP evidence.
• Accept deliverables only with recorded security assurance.

Templates and checklists

• Outsourced Development Security Requirements Checklist
• Outsourced Development Review Register
• Supplier Development Evidence Request List
• Supplier Security Responsibility Matrix
• Supplier Security Risk Assessment
• A.8.30 Audit Checklist