CVE-2025-66689

Name: CVE-2025-66689
Creator: NVD / NIST
Published: 2026-01-12T17:15:52.297+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.48%

Last modified Jun 17, 2026

CVE-2025-66689 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. A path traversal vulnerability exists in Zen MCP Server before 9.8.2 that allows authenticated attackers to read arbitrary files on the system. The vulnerability is caused by flawed logic in the is_dangerous_path() validation function that uses exact string matching against a blacklist of system directories. EPSS estimates a 0.48% chance of exploitation in the next 30 days.

Description

A path traversal vulnerability exists in Zen MCP Server before 9.8.2 that allows authenticated attackers to read arbitrary files on the system. The vulnerability is caused by flawed logic in the is_dangerous_path() validation function that uses exact string matching against a blacklist of system directories. Attackers can bypass these restrictions by accessing subdirectories of blacklisted paths.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.48%

37.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Busymac	Pal Mcp Server	< 9.8.2

References

https://github.com/BeehiveInnovations/zen-mcp-server/issues/293Exploit, Issue Tracking, Third Party Advisory
https://github.com/Team-Off-course/MCP-Server-Vuln-Analysis/blob/main/CVE-2025-66689.mdExploit, Third Party Advisory

Timeline

Published: Jan 12, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-66689?

How severe is CVE-2025-66689?

CVE-2025-66689 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.48% probability of exploitation in the next 30 days.

How do I fix CVE-2025-66689?

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-2025-66689?

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

Scan your code now

Source: NVD / NIST