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What Is the MCP Python SDK OAuth Flaw? (Sept 29, 2026)

This story is from 2026-10-02. It is preserved in the archive; the latest stories are on the live feed.

Today's security advisory on the official MCP Python SDK is worth more than a skim: a malicious MCP server could steal an app's OAuth credentials — client secret, authorization code, and the PKCE proof key — by answering one question wrong: "where do I log in?" What happened: when an MCP client nee…

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  1. 2026-10-02 00:28 · DEV Community — AI
    What Is the MCP Python SDK OAuth Flaw? (Sept 29, 2026)

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