How to Audit an MCP Server in 60 Seconds (Automated Script)

Before you install any MCP server into your Claude or Cursor environment, run this script. It checks the 8 most common vulnerabilities in under a minute. Why This Matters MCP servers execute code inside your AI session. They have access to your filesystem, environment variables, and network. Most developers install them without review. I scanned 50 open-source MCP servers. 43 had at least one exploitable vulnerability. The most common: command injection via shell=True , path traversal in file tools, and hardcoded API keys in source. The Quick Audit Script Save this as audit_mcp.py and run it against any MCP server directory: #!/usr/bin/env python3 """ Quick MCP server security audit. """ import os , re , sys from pathlib import Path FINDINGS = [] def check ( severity , title , detail ): FINDINGS . append (( severity , title , detail )) icon = " X " if severity == " HIGH " else " ! " if severity == " MEDIUM " else " OK " print ( f " [ { icon } ] [ { severity } ] { title } " ) if detail