CVE-2025-66401

Name: CVE-2025-66401
Creator: NVD / NIST
Published: 2025-12-01T23:15:53.227+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.97%

Last modified Jun 17, 2026

CVE-2025-66401 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. MCP Watch is a comprehensive security scanner for Model Context Protocol (MCP) servers. In 0.1.2 and earlier, the MCPScanner class contains a critical Command Injection vulnerability in the cloneRepo method. EPSS estimates a 1.97% chance of exploitation in the next 30 days.

Description

MCP Watch is a comprehensive security scanner for Model Context Protocol (MCP) servers. In 0.1.2 and earlier, the MCPScanner class contains a critical Command Injection vulnerability in the cloneRepo method. The application passes the user-supplied githubUrl argument directly to a system shell via execSync without sanitization. This allows an attacker to execute arbitrary commands on the host machine by appending shell metacharacters to the URL.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.97%

77.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Kapilduraphe	Mcp Watch	<= 0.1.2

References

https://github.com/kapilduraphe/mcp-watch/commit/e7da78c5b4b960f8b66c254059ad9ebc544a91a6Patch
https://github.com/kapilduraphe/mcp-watch/security/advisories/GHSA-27m7-ffhq-jqrmExploit, Vendor Advisory

Timeline

Published: Dec 1, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-66401?

How severe is CVE-2025-66401?

CVE-2025-66401 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.97% probability of exploitation in the next 30 days.

How do I fix CVE-2025-66401?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-66401?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST