9.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-66401

CVE-2025-66401: MCP Watch has a Critical Command Injection in cloneRepo allows Remote Code Execution (RCE) via malicious URL

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.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-66401

CVE-2025-66401:

9.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
mcp-watch	npm	<= 0.1.2

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability is a classic command injection in the cloneRepo function of the MCPScanner class. The provided patch in commit e7da78c5b4b960f8b66c254059ad9ebc544a91a6 clearly shows the remediation. The vulnerable code was using execSync to shell out to git clone, and the user-controlled url was concatenated directly into the command string. This is a textbook example of command injection. The fix replaces execSync with spawnSync, which correctly handles arguments by passing them as an array to the executable, thus preventing shell interpretation of special characters in the URL. The vulnerable function is therefore MCPScanner.cloneRepo as it is the function that contains the dangerous call to execSync with unsanitized user input.

Vulnerable functions

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Vulnerability Intelligence
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WAF Protection Rules

WAF Rule

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Reasoning

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