"Inherent security flaws are raising questions about the safety of AI systems built on the Model Context Protocol (MCP).
Developed by Anthropic, MCP is an open source specification for connecting large language model-based AI agents with external data sources — called MCP servers.
As the first proposed industry standard for agent-to-API communication, interest in MCP has surged in recent months, leading to an explosion in MCP servers.
In recent weeks, developers have sounded the alarm that MCP lacks default authentication and isn’t secure out of the box — some say it’s a security nightmare.
Recent research from Invariant Labs shows that MCP servers are vulnerable to tool poisoning attacks, in which untrusted servers embed hidden instructions in tool descriptions.
Anthropic, OpenAI, Cursor, Zapier, and other MCP clients are susceptible to this type of attack..."
https://thenewstack.io/building-with-mcp-mind-the-security-gaps/