AIKIDO-2026-280397
tomcat-embed-websocket is vulnerable to Insufficient Session Expiration
68
Medium Risk
This Affects:
tomcat-embed-websocketTL;DR
tomcat-embed-websocket does not close a WebSocket session when its authenticated HTTP session ends if the HTTP session ID changed after the WebSocket was opened. The WebSocket stays connected after logout or session invalidation. That leaves an authenticated channel open past the HTTP session lifetime. The fix closes the WebSocket when the HTTP session ends, including after a session ID change.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and a WebSocket is opened under an authenticated HTTP session whose session ID is later changed.
Background info
tomcat-embed-websocket is vulnerable to Insufficient Session Expiration in versions 7.0.43 - 9.0.120, 10.1.0 - 10.1.57 and 11.0.0 - 11.0.24.
How to fix this
Upgrade the org.apache.tomcat.embed:tomcat-embed-websocket library to the patch version.
Links
tomcat.apache.org/security-11.html#Fixed_in_Apache_Tomcat_11.0.25lists.apache.org/thread/3j15vztszpyqss253mjq5v1kp7s6hooqopenwall.com/lists/oss-security/2026/08/26/10
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