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MCP client holding OAuth credentials while a rogue server points toward the wrong authorization server

A Hostile MCP Server Could Steer OAuth Secrets Away From the Official TypeScript SDK’s Clients

CVE-2026-104850, published on October 6, 2026, is a High-severity flaw in the OAuth client support of the official Model Context Protocol TypeScript SDK. A malicious MCP server could name its own authorization server and receive stored refresh tokens or client secrets. Fixes shipped in @modelcontextprotocol/sdk 1.31.0 and @modelcontextprotocol/client 2.2.0, and some setups also need configuration changes.

4 min read