AI vendor security
AI Vendor Security Checklist for Procurement Teams
Evaluate the system’s permissions and failure paths before you judge the polish of its answers.
Open the checklistThe risk is not missing out. It is adopting AI faster than you can govern it, then having to answer for it to an auditor, a board, or the public. In 2026 that means governing agents that act, the identities and credentials they hold, and the control planes that grant their authority, with a risk register that changes as fast as the systems it describes.
Reviewed October 5, 2026 · Standards in force

An annual AI assessment describes a system that no longer exists by the time the report is signed. Models are swapped, prompts change, agents gain tools and connectors, and vendors ship features weekly. On October 2, AWS fixed a CVSS 10.0 flaw that could hand any network client super-admin control of the Loom agent control plane, including stored credentials and IAM role policies, and GitLab fixed a 9.9 sandbox escape in its AI Gateway. The control has to be continuous: every AI system and agent on a live register, every grant of authority scoped and revocable, and every deviation detected while it can still be stopped.
B3 analysis. Each row maps a control to the standard an auditor is most likely to cite.
| Control area | Static model (retire) | Continuous model (2026) | Framework anchor |
|---|---|---|---|
| Risk register | Spreadsheet refreshed at the annual review | Live inventory of models, agents and connectors; risk re-scored on every change | NIST AI RMF Govern and Map; ISO/IEC 42001 clause 6 |
| Agent governance | Policy says “human in the loop” | Scoped identities, least-privilege tools, approval gates for high-impact actions, a tested kill switch | OWASP ASI02–ASI03; Five Eyes agentic guidance |
| Prompt-injection defense | Vendor assurance letter | Untrusted-content isolation, tool-call allowlists, output filtering, recurring red-team prompts | OWASP ASI01; NIST AI RMF Measure |
| Drift detection | Accuracy test at go-live | Baselines for quality, refusals, cost and tool calls with paging alerts and rollback | NIST AI RMF Manage; ISO/IEC 42001 clause 9 |
| Evidence | Screenshots assembled before the audit | Logs, approvals and test results collected automatically and retained | ISO/IEC 42001 clause 7.5; EU AI Act record-keeping |
| Model memory and code leakage | Trust the vendor's privacy page | Memory and retention settings documented per tool, secret scanning before code reaches an assistant, purge tested | OWASP LLM02 Sensitive Information Disclosure; ISO/IEC 42001 Annex A data controls |
| Non-human identity boundaries | Agents run on shared service accounts | One identity per agent, scoped tools, expiring tokens, identity provider in front of every control plane | Microsoft DDR 2026 agent identity; SOC 2 CC6.1–CC6.3 |
| Agent drift detection | Spot checks after complaints | Automated baselines for tool-call mix, destinations and volume, with auto-pause on deviation | NIST AI RMF Measure and Manage; OWASP Top 10 for Agentic Applications |
| AI incident evidence | Chat transcripts saved ad hoc | Action-level logs per agent identity, retained and replayable, with a named owner for AI incident decisions | White House accord internal controls; NIST AI RMF Govern 1.5 and Manage 4 |
| Agent execution boundary | Agent warns the user after acting | Untrusted content cannot trigger code execution or outbound actions without policy approval; connected accounts scoped to the task | NIST AI RMF Manage 2; OWASP LLM01 prompt injection |
This is one of the six domains in the readiness assessment. See where your organization actually stands.
Take the readiness assessmentSalt Labs showed that an obfuscated payload in a single email ran code in the Manus agent's cloud sandbox before its warning appeared, reaching the email, storage and code accounts the user had connected. The issue was reported through Meta's bug bounty and fixed; there is no CVE. Separately, Korean investigators suspect AI agents probed seven lenders for weak points.
Test now: Send one benign, obfuscated test instruction to an inbox your agent reads. If it acts before anything stops it, restrict its execution rights first.
Read the October 5 brief →Curated public-sector and regulated-technology speeches, each with buyer-side commentary.
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