CVE-2025-49596CWE-306

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

Critical · published June 13, 2025

CVSS v4.0

9.4

EPSS

44%

Percentile

98.8

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v4.0: 9.4 · CRITICAL
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
EPSS: 0.44453 · 98.8th percentile
Weakness: CWE-306 · Missing Authentication for Critical Function
Published: 2025-06-13T20:11Z

EPSS history

Timeline

13 JUN 20:11Z
MCP Inspector proxy server lacks authentication between the Inspector client and proxy
cvelistv5