Multi-agent systems delegate work through protocols that are often implicitly trusted. An attacker who can inject or alter a message between a planner and an executor agent can issue commands with the planner's authority.
Authenticate every agent-to-agent message with mutual TLS or signed messages, authorize which agents may request which actions, validate message schemas, and protect against replay with nonces and expiry.
The same feature written the risky way, then with the fix applied.
How this risk has ranked in each OWASP release.
2026Latest
#07asi07-2026 Insecure Inter-Agent Communication
