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5. Unauthorized Tool Usage via Field Injection

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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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