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I broke an MCP server in 10 minutes — the exact prompt injection attack chain (with fixes)

This story is from 2026-08-25. It is preserved in the archive; the latest stories are on the live feed.

Most MCP servers in production right now have the same flaw: nothing separates data from instructions . I tested this against a real server setup and got data exfiltration working in 10 minutes. Here's the full chain. The setup An MCP server exposing two tools: read_file — reads any path the proces…

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  1. 2026-08-25 17:59 · DEV Community — AI
    I broke an MCP server in 10 minutes — the exact prompt injection attack chain (with fixes)

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