I Audited 9 MCP Servers and Found Critical Vulnerabilities

I Audited 9 MCP Servers and Found Critical Vulnerabilities The Model Context Protocol (MCP) has exploded — 97 million monthly SDK downloads, 10,000+ servers, and adoption by every major AI company. But here's what nobody talks about: 66% of MCP servers have critical security vulnerabilities. I built and deployed 9 MCP servers on Cloudflare Workers. Then I audited all of them using the OWASP Agentic AI Top 10 framework. Here's what I found. The Numbers (Real Data) From scanning my own servers + cross-referencing a study of 1,808 MCP servers: Vulnerability Category Prevalence Severity Shell/Command Injection 43% Critical Tooling Infrastructure Gaps 20% High Authentication Bypass 13% Critical Path Traversal 10% High Prompt Injection via Tools 8% Critical Data Exfiltration 6% Medium 30 CVEs were filed against MCP servers in January-February 2026 alone. The average security score of audited servers? 34 out of 100. The 6 Vulnerability Categories I Check 1. Authentication & Authorization