Vulnerability · Published Oct 12, 2026 · Assigned by VulnCheck
CVE-2026-108953mac-shell-mcp before 2.0.0 OS Command Injection via execute_command Arguments
High 7.8
In plain English
A high-severity OS command injection in mac-shell-mcp from cfdude. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 55% of all known vulnerabilities).
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.7%top 44.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
mac-shell-mcp before 2.0.0 contains an OS command injection vulnerability that allows MCP clients to bypass the command whitelist by injecting shell metacharacters into execute_command arguments. Attackers or malicious prompts can call a safe command such as pwd with arguments like ';' to run forbidden commands as the server user without approval.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| cfdude | mac-shell-mcp | 0 – before 2.0.0 |
Weakness: CWE-78 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/cfdude/mac-shell-mcp/issues/45 issue-tracking
- https://github.com/cfdude/mac-shell-mcp/commit/932ce733cde07bb30b1f186303e6692dbb5d087a patch
- https://github.com/cfdude/mac-shell-mcp/blob/1c1708201abb7a18c83075e1bf933e7a92cbeb9f/src/services/command-service.ts#L257-L340 technical-description
- https://github.com/cfdude/mac-shell-mcp product
- VulnCheck Advisory: mac-shell-mcp before 2.0.0 OS Command Injection via execute_command Arguments third-party-advisory