MCP TypeScript client SDK: HTTP client transports and OAuth requests followed cross-origin redirects and re-sent custom headers and request bodies

影響: npm:@modelcontextprotocol/sdk < 1.32.0 → 1.32.0, npm:@modelcontextprotocol/client >= 2.0.0, < 2.3.0 → 2.3.0 Summary In affected versions, the SDK's HTTP client transports and OAuth requests followed redirects to any origin. If an MCP server or authorization server redirected a request to another origin, that origin received custom request headers (such as an X-API-Key set in requestInit.headers) and the mcp-session-id header. On a 307 or 308 it also received the request body, including OAuth token requests with their refresh_token and client_secret. On current runtimes fetch already drops the Authori…

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