CVE-2025-49596 CRITICAL

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

Vendor Modelcontextprotocol
Product inspector
Weakness CWE-306 · Missing auth
Published June 13, 2025
Last update July 9, 2025
View on NVD All CVEs

CVSS base score

9.4/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction —
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 13, 2025 CVE published
July 9, 2025 Record updated