MCPHunt benchmark finds 11.5-41.3% policy-violating credential propagation in multi-server MCP agents across five models, reducible up to 97% by prompt mitigations while retaining most utility.
Q.1 Aggregate Mitigation Results Table 19: Mitigation effectiveness (GPT-5.4, risky environments)
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MCPHunt: An Evaluation Framework for Cross-Boundary Data Propagation in Multi-Server MCP Agents
MCPHunt benchmark finds 11.5-41.3% policy-violating credential propagation in multi-server MCP agents across five models, reducible up to 97% by prompt mitigations while retaining most utility.