Vendor Security Review Checklist
Vendors can become part of your security posture. A simple review process helps teams understand which suppliers touch sensitive data or production systems and what evidence supports trust.
How to Use This Guide
Use this guide to prepare a practical evidence set before a customer, investor, auditor, or internal reviewer asks for security readiness details. It is educational guidance only and should be adapted to your systems, data sensitivity, and review scope.
Classify vendors by risk
Separate critical production vendors, customer-data subprocessors, internal productivity tools, and low-risk services. Review depth should match impact and data exposure.
Collect assurance evidence
Request SOC 2 reports, ISO certificates, security whitepapers, penetration-test summaries, subprocessors, and incident notification commitments where relevant.
Review contracts and access
Confirm data processing terms, breach notification obligations, security clauses, support access, retention terms, and offboarding expectations before renewal.
Track review decisions
Record reviewer, date, risk decision, exceptions, compensating controls, and next review date. Evidence that cannot be found later does not help during customer review.
Evidence to Prepare
- Current policy or procedure that explains the control.
- Dated screenshots, exports, tickets, or logs that show the control operates.
- Named owner, review date, and remediation status for open gaps.
- Clear limitation notes where the evidence is incomplete or scope-specific.
Key Takeaways
- Vendor reviews should be risk-based, not one-size-fits-all.
- Renewal is a natural checkpoint for security review.
- Critical supplier evidence should be easy to retrieve.