I Audited 9 MCP Servers and Found Critical Vulnerabilities

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<p>In January and February 2026, security researchers filed <a href="https://www.heyuan110.com/posts/ai/2026-03-10-mcp-security-2026/" rel="noopener noreferrer">30 CVEs against

<p>Most API documentation is written for humans.</p> <p>MCP tool descriptions are different.</p> <p>They are read by the model that decides what to call next.</p> <p>That means

<h2> The Setup </h2> <p>MCP (Model Context Protocol) lets AI agents call external tools. Instead of just reading files and running bash, the agent gets structured access to APIs,

<p>Open your shell history before you open a course catalog. The <code>jq</code> filters, the <code>grep -v</code> chains against Zeek logs, the PowerShell one-liners you paste

<p>There's a class of prompt injection attack that bypasses almost every AI firewall on the market — and it's sitting in the blind spot of your agentic stack right now.</p>

<h1> MCP Security Vulnerabilities in 2026: What Every Agent Developer Must Know </h1> <p>The Model Context Protocol (MCP) has become the universal "USB-C port for AI applications"

<p>You built your app with Lovable, Cursor, or Bolt. You connected Supabase. You enabled Row Level Security because the docs said to.</p> <p>Your RLS is probably wrong.</p> <p>I