PYSEC-2026-3482 MCP Python SDK: HTTP transports serve session requests without verifying the authenticated principal

Summary In affected versions, the SSE and Streamable HTTP server transports routed incoming requests to an existing session based only on the session identifier, without verifying that the request was authenticated as the same principal that created the session. Anyone who learned or guessed a...

Session fixation

A vulnerability, in Brocade SANnav versions before v2.0, could allow remote attackers to brute-force a valid session ID. The vulnerability is due to an insufficiently random session ID for several post-authentication actions in the SANnav portal...