auth, mcp: add UserID to TokenInfo for session hijacking prevention #695
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Add a UserID field to auth.TokenInfo that TokenVerifiers can populate from JWT "sub" claims or token introspection. The streamable HTTP transport uses this to bind sessions to users, rejecting requests where the user ID doesn't match the session's original user. Fixes modelcontextprotocol#589
markus-kusano
approved these changes
Dec 8, 2025
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Add a UserID field to auth.TokenInfo that TokenVerifiers can populate from JWT "sub" claims or token introspection. The streamable HTTP transport uses this to bind sessions to users, rejecting requests where the user ID doesn't match the session's original user.
Fixes #589