OWASP MCP Security Testing Guide
The Model Context Protocol (MCP) is an open protocol that lets LLM applications connect to external data sources, tools, prompts, workflows, and services. This guide treats MCP as a security boundary: the chain from the user, through the model and MCP client, to the MCP server, the connected tool, and the target system.
It is a living collection of MCP security knowledge for developers, AppSec, red teams, and SOC teams. It covers threats, secure development, host and client controls, supply chain, enterprise gateways, detection, incident response, taxonomy, public incidents, case studies, and review checklists. Host and client controls are in .
