CVE-2025-66689 Path traversal in n/a
Authenticated attackers can read arbitrary system files by bypassing path validation in Zen MCP Server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-66689?
CVE-2025-66689 is a medium-severity path traversal vulnerability in n/a, published on 12 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2025-66689?
It affects 1 product.
Products include Busymac Pal Mcp Server.
How do I fix CVE-2025-66689?
No fix has been published for CVE-2025-66689 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2025-66689 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66689 exists.
Sources
Also known as GHSA-577g-w45q-4pwf.