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MCP Security in 2026: The OAuth SDK CVEs, Tested, and How to Lock Down Your Server

This story is from 2026-10-18. It is preserved in the archive; the latest stories are on the live feed.

MCP security in October 2026 mostly means OAuth. Within two days of each other, both official MCP SDKs, TypeScript and Python, published high-severity advisories for the same flaw: a malicious MCP server could make your client send its OAuth credentials to an authorization server the attacker contr…

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  1. 2026-10-18 18:03 · DEV Community — AI
    MCP Security in 2026: The OAuth SDK CVEs, Tested, and How to Lock Down Your Server

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