TrustFall shows how project-defined MCP configuration can turn a generic “trust this folder” decision into unsandboxed command execution in several coding agents, with zero-click variants in unattended CI. The vendor-authored research traces the issue to conflating permission to read or edit a workspace with permission to start repository-supplied executables.
TrustFall: coding agent security flaw enables one-click RCE in Claude, Cursor, Gemini CLI and GitHub Copilot
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