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MCP security: how a malicious MCP server can steal your secrets, and how to lock it down

This story is from 2026-10-20. It is preserved in the archive; the latest stories are on the live feed.

Adding an MCP server takes one line. Someone shares a repo, the README says npx -y some-mcp-server , you paste it into your config, and a few seconds later your AI agent has new tools. It feels like installing a browser extension. It is closer to running a stranger's script with your user account,…

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  1. 2026-10-20 13:15 · DEV Community — AI
    MCP security: how a malicious MCP server can steal your secrets, and how to lock it down

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