CVE-2025-49596: MCP Inspector proxy server lacks authentication between the Inspector client and proxy
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. Credit: Rémy Marot
Published Jun 13, 2025 · Updated Jul 9, 2025
Affected packages
@modelcontextprotocol/inspector
- Ecosystem
- npm
- Affected
- < 0.14.1
- Fixed in
- 0.14.1
- Check
npm ls @modelcontextprotocol/inspector
Advisory details
From the GitHub Advisory Database (CC BY 4.0).
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.
Credit: Rémy Marot
Credited to JLLeitschuh.
References
- https://github.com/modelcontextprotocol/inspector/security/advisories/GHSA-7f8r-222p-6f5g
- https://nvd.nist.gov/vuln/detail/CVE-2025-49596
- https://github.com/modelcontextprotocol/inspector/commit/50df0e1ec488f3983740b4d28d2a968f12eb8979
- https://thenewstack.io/mcp-vulnerability-exposes-the-ai-untrusted-code-crisis
- https://www.oligo.security/blog/critical-rce-vulnerability-in-anthropic-mcp-inspector-cve-2025-49596
- https://github.com/advisories/GHSA-7f8r-222p-6f5g
How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology