CVE-2026-108953
mac-shell-mcp before 2.0.0 OS Command Injection via execute_command Arguments
CVSS Score
7.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-78 |
| Vendor | cfdude |
| Product | mac-shell-mcp |
| Published | Oct 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
cfdude / mac-shell-mcp
0 < 2.0.0
References
github.com: https://github.com/cfdude/mac-shell-mcp/issues/45 github.com: https://github.com/cfdude/mac-shell-mcp/commit/932ce733cde07bb30b1f186303e6692dbb5d087a github.com: https://github.com/cfdude/mac-shell-mcp/blob/1c1708201abb7a18c83075e1bf933e7a92cbeb9f/src/services/command-service.ts#L257-L340 github.com: https://github.com/cfdude/mac-shell-mcp vulncheck.com: https://www.vulncheck.com/advisories/mac-shell-mcp-before-2.0.0-os-command-injection-via-execute-command-arguments
Credits
Bandana (HackWitHer), APIsec Research Labs