5. Unauthorized Tool Usage via Field Injection
5. Unauthorized Tool Usage via Field Injection
Attack: User tampers with server_hint or tool fields to invoke unintended behavior. Example: “tool”: “internal_vuln_scanner”, “params”: {“scan_depth”: “full_root”} Mitigation:- Map tools via task types, not user-submitted names
- Use explicit allowlists per task
- Rate-limit sensitive tools
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