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RAG & MCP

4.5 — Security in MCP: Step-by-Step

MCP servers are trust boundaries — they sit between an LLM (which can be manipulated via prompt injection) and real systems with real data. Security is not optional. Here's a 6-layer defense model.

MCP Security: 6-Layer Defense Model

Layer 1: Transport Security

Transport Security Model What to Configure
stdio Inherits OS user permissions. No network exposure Ensure server process runs as the end user, not root. Use file permissions on the server script
SSE / HTTP Standard HTTPS. Requires TLS termination TLS certificates, CORS headers, reverse proxy. Never expose MCP over plain HTTP

Layer 2: Authentication — Who Is Calling?

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