Security Audit of 23 Public MCP Servers Finds Critical Flaws in Community Builds

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Researchers scanned 23 Model Context Protocol (MCP) servers using a zero-execution static auditor to assess security risks as AI agents increasingly connect to local systems and databases. The audit covered official Anthropic reference servers, archived implementations, and popular community builds, revealing that Anthropic's own servers largely scored clean while the community-built FastMCP server received a failing grade. Key vulnerabilities discovered included a ZipSlip path traversal flaw in archive extraction, unauthenticated SSE endpoints bound to 0.0.0.0 allowing open network access, and file-reading tools that accepted unvalidated paths from LLMs. The researchers also warned that several existing MCP scanners are themselves dangerous, as they execute commands from target config files, effectively running arbitrary remote code on the scanning machine. Recommended fixes include enforcing strict path boundary checks, restricting transport bindings to localhost by default, and requiring authentication for any publicly exposed endpoints.

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