OWASP GenAI Security Project · September 2, 2026

OWASP updates LLM Top 10 and adds Agent Control Standard

Why it matters

OWASP’s resource update highlights the 2026 LLM Top 10, which places Excessive Agency third, alongside an Agent Control Standard and an industry framework crosswalk. ACS defines middleware hooks for portable runtime policies. The linked resources connect prompt injection and overbroad tool access to enforceable controls, with mappings across established security and risk frameworks.

My takeaway: Use the updated risk scenarios to review tool permissions and action boundaries, then map each relevant risk to an implemented control and test evidence. Evaluate ACS hooks against the agent frameworks you actually run. A framework mapping documents coverage; verify separately that the runtime blocks unauthorized actions and records the decision.
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