CVE-2026-108953: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in cfdude mac-shell-mcp
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.
CVSS v4.0
Score 8.5high
Affected software
cfdude
mac-shell-mcp
pkg:github/cfdude/mac-shell-mcpRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-108953 describes an OS command injection vulnerability in mac-shell-mcp prior to version 2.0.0. The vulnerability arises because MCP clients can inject shell metacharacters into the arguments of the execute_command function, bypassing the intended command whitelist. This allows attackers or malicious prompts to execute arbitrary commands on the server with the privileges of the server user, circumventing security controls.
Potential Impact
Successful exploitation allows an attacker with low privileges to execute arbitrary OS commands on the server, potentially leading to unauthorized actions and compromise of the server environment. The vulnerability has a high CVSS 4.0 score of 8.5, indicating significant impact on confidentiality, integrity, and availability.
Mitigation Recommendations
No explicit patch or remediation information is provided. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, avoid using vulnerable versions and restrict access to the mac-shell-mcp service to trusted users only.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-11T19:04:35.850Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6accd7452cdf04f6569338a2
Added to database: 10/12/2026, 12:49:09 UTC
Last enriched: 10/12/2026, 13:03:15 UTC
Last updated: 10/12/2026, 21:47:26 UTC
Views: 18
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