gemini-cli - 💡(How to fix) Fix Unauthenticated MCP Server Metadata Access [1 comments, 2 participants]

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google-gemini/gemini-cli#26832Fetched 2026-05-11 03:27:10
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What happened?

The /listCommands endpoint exposes all available tools and their schemas without any authentication, revealing the capabilities of the agent and the structure of the workspace.

What did you expect to happen?

Capability discovery should be protected behind the same authentication layer as command execution.

Client Information

<details> <summary>Client Information</summary>

OS: linux Date: Sunday, May 10, 2026 Gemini CLI: 0.42.0-nightly

</details>

Login information

Automated audit with Gemini CLI.

Anything else we need to know?

File: packages/a2a-server/src/http/app.ts, Lines 251-285. This allows an attacker to map out the agent's environment and identify potential vulnerabilities in the available tools.

Severity: Medium Area: area/security

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gemini-cli - 💡(How to fix) Fix Unauthenticated MCP Server Metadata Access [1 comments, 2 participants]