CVE-2025-66401 MCP Watch has a Critical Command Injection in cloneRepo allows Remote Code Execution (RCE) via malicious URL
Attackers can execute arbitrary commands on the host by injecting shell metacharacters into a GitHub URL passed to the cloneRepo method.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-66401?
CVE-2025-66401 is a critical command injection vulnerability in kapilduraphe mcp-watch, published on 1 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
MCP Watch is a comprehensive security scanner for Model Context Protocol (MCP) servers. In 0.1.2 and earlier, the MCPScanner class contains a critical Command Injection vulnerability in the cloneRepo method. The application passes the user-supplied githubUrl argument directly to a system shell via execSync without sanitization. This allows an attacker to execute arbitrary commands on the host machine by appending shell metacharacters to the URL.
Weakness: CWE-78
Which versions are affected by CVE-2025-66401?
2 open source packages ship an affected version, including mcp-watch. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
mcp-watch npm | All versions to 0.1.2 | None |
mcp-watch npm | All versions to 0.1.2 | None |
Products include Kapilduraphe Mcp Watch.
How do I fix CVE-2025-66401?
No fix has been published for CVE-2025-66401 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-2025-66401 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66401 exists.
Sources
Also known as GHSA-27m7-ffhq-jqrm.