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CVE-2025-66689

22
FAUCET Score

CVE-2025-66689 is a path traversal vulnerability affecting Zen MCP Server versions prior to 9.8.2, specifically impacting busymac pal_mcp_server. Authenticated attackers can exploit a flaw in the is_dangerous_path() validation function to read arbitrary files by accessing subdirectories of blacklisted system paths. This vulnerability carries a CVSS score of 6.5 (Medium), indicating a network-based attack with low complexity and requiring low privileges, potentially leading to high confidentiality impact. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 9.8.2CPE matchmatch criteria
cpe:2.3:a:busymac:pal_mcp_server:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.48%
Probability of exploitation in next 30 days
EPSS Percentile
38.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0048 is in the 48th percentile among its peer group of 21,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

github.com / BeehiveInnovations/zen-mcp-server/issues/293
ExploitIssue TrackingThird Party Advisory
github.com / Team-Off-course/MCP-Server-Vuln-Analysis/blob/main/CVE-2025-66689.md
ExploitThird Party Advisory