Medium severity6.5OSV Advisory· Published Jan 12, 2026· Updated Jun 17, 2026
CVE-2025-66689
CVE-2025-66689
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.
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Affected products
3v1.1.0, v5.10.0, v5.10.1, …+ 1 more
- (no CPE)range: v1.1.0, v5.10.0, v5.10.1, …
- (no CPE)range: <9.8.2
Patches
Vulnerability mechanics
References
2- github.com/BeehiveInnovations/zen-mcp-server/issues/293nvdExploitIssue TrackingThird Party Advisory
- github.com/Team-Off-course/MCP-Server-Vuln-Analysis/blob/main/CVE-2025-66689.mdnvdExploitThird Party Advisory
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