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CVE-2025-66689

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Date: January 11, 2026

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.

Severity Score

Related Resources (4)

https://nvd.nist.gov/vuln/detail/CVE-2025-66689
https://github.com/Team-Off-course/MCP-Server-Vuln-Analysis/blob/main/CVE-2025-66689.md
https://github.com/BeehiveInnovations/zen-mcp-server/issues/293
https://www.mend.io/vulnerability-database/CVE-2025-66689

Severity Score

Weakness Type (CWE)

Files or Directories Accessible to External Parties

CWE-552

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CWE-22

Top Fix

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Upgrade Version

Upgrade to version https://github.com/BeehiveInnovations/pal-mcp-server.git - v9.8.2

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

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