CVE-2025-66689

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-01-12 · updated 2026-06-17
Weakness: CWE-22

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.

Affected products

Busymac Pal Mcp Server: before 9.8.2 — fixed in 9.8.2

How to fix

Upgrade to a fixed version: Busymac Pal Mcp Server 9.8.2. Check the vendor advisory for mitigations.

References

https://github.com/BeehiveInnovations/zen-mcp-server/issues/293
https://github.com/Team-Off-course/MCP-Server-Vuln-Analysis/blob/main/CVE-2025-66689.md

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