CVE-2025-58444CWE-84

MCP Inspector is Vulnerable to Potential Command Execution via XSS When Connecting to an Untrusted MCP Server

High · published September 8, 2025

CVSS v4.0
8.6
EPSS
1%
Percentile
49.8
In the wild
Unconfirmed
What it is

The MCP inspector is a developer tool for testing and debugging MCP servers. A cross-site scripting issue was reported in versions of the MCP Inspector local development tool prior to 0.16.6 when connecting to untrusted remote MCP servers with a malicious redirect URI. This could be leveraged to interact directly with the inspector proxy to trigger arbitrary command execution. Users are advised to update to 0.16.6 to resolve this issue.

The record
Technical detail
CVSS v4.0
8.6 · HIGH
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
EPSS
0.00672 · 49.8th percentile
Weakness
CWE-84 · Improper Neutralization of Encoded URI Schemes in a Web Page
Published
2025-09-08T21:24Z
EPSS history
Timeline
  • 08 SEP 21:24Z
    MCP Inspector is Vulnerable to Potential Command Execution via XSS When Connecting to an Untrusted MCP Server
    cvelistv5