MCP Inspector proxy server lacks authentication between the Inspector client and proxy

CRITICAL 9.4CVE-2025-49596 · GHSA-7f8r-222p-6f5g · Published 13/06/2025 · updated 17/06/2026

Package	Affected versions	Patched versions
@modelcontextprotocol/inspector npm	`< 0.14.1`	`0.14.1`

Description

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 [email protected]

NVD 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.

References

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Package

Affected versions

Patched versions

@modelcontextprotocol/inspector

npm

< 0.14.1

0.14.1

Description

Credit: Rémy Marot [email protected]

NVD description