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CVE-2025-49596 PoC — MCP Inspector proxy server lacks authentication between the Inspector client and proxy

Source
https://github.com/ashiqrehan-21/MCP-Inspector-CVE-2025-49596
Associated Vulnerability
Title: MCP Inspector proxy server lacks authentication between the Inspector client and proxy (CVE-2025-49596)
Description:The MCP inspector is a developer tool for testing and debugging MCP servers. Versions of MCP Inspector below 0.14.1 are vulnerable to remote code execution due to lack of authentication between the Inspector client and proxy, allowing unauthenticated requests to launch MCP commands over stdio. Users should immediately upgrade to version 0.14.1 or later to address these vulnerabilities.
Description
MCP-Inspector-vulncheck is a Python script that checks if an MCP Inspector server is vulnerable to CVE-2025-49596. It tests whether the /sse endpoint responds to unauthenticated requests, indicating a potential security flaw. The script is simple to use and provides clear output on whether the target server is likely vulnerable or patched.
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