CVE-2026-108953 mac-shell-mcp before 2.0.0 OS Command Injection via execute_command Arguments
Attackers can execute arbitrary shell commands by injecting metacharacters into arguments, bypassing whitelists in mac-shell-mcp.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-108953?
CVE-2026-108953 is a high-severity command injection vulnerability in cfdude mac-shell-mcp, published on 12 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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.
Weakness: CWE-78
Which versions are affected by CVE-2026-108953?
How do I fix CVE-2026-108953?
No fix has been published for CVE-2026-108953 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-108953 being exploited?
There is no known exploitation of CVE-2026-108953 in the wild and no public exploit code.
Sources
Also known as GHSA-ffv7-8x5h-5w7r.