Tip: Put Authentication in Front of Every Remote MCP Server and De-List the Unauthenticated Ones
Adversa AI·medium signal
With June 2026 scans counting 12,520+ internet-accessible MCP services (most unauthenticated) and CVSS 9.8 command-injection CVEs in unofficial cloud MCP servers, the single highest-leverage hardening move is to require auth on every remote MCP endpoint and take public, unauthenticated servers off the internet entirely. Treat any MCP server as a remote code-execution surface, not just a tool list, before wiring it into an agent.