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GitHub MCP exploited: Accessing private repositories via MCP
We showcase a critical vulnerability with the official GitHub MCP server, allowing attackers to access private repository data. The vulnerability is among the first discovered by Invariant's security analyzer for detecting toxic agent flows.
It is highly relevant to raise awareness about this issue at this time, as the industry is racing to deploy coding agents and IDEs widely, potentially exposing users to similar attacks on critical software development tools. The recently introduced proxy mode in MCP-scan significantly simplifies this process by enabling real-time security scanning of MCP connections without requiring modifications to your existing agent infrastructure. Implementing comprehensive monitoring also creates an audit trail that helps identify potential vulnerabilities, detect exploitation attempts, and ensure your agent systems remain protected against emerging attacks.
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