Bug 2539355 (CVE-2026-76183) - CVE-2026-76183 tomcat: Apache Tomcat: Authentication Bypass in WebSocket Endpoints
Summary: CVE-2026-76183 tomcat: Apache Tomcat: Authentication Bypass in WebSocket Endp...
Keywords:
Status: NEW
Alias: CVE-2026-76183
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2543044
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-23 11:33 UTC by OSIDB Bzimport
Modified: 2026-09-29 10:06 UTC (History)
10 users (show)

Fixed In Version:
Clone Of:
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Last Closed:
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Description OSIDB Bzimport 2026-09-23 11:33:25 UTC 
Authentication Bypass by Alternate Name vulnerability in Apache Tomcat allowed the security constraints for any WebSocket endpoint to be bypassed.



This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M1 through 9.0.121.



The following versions were EOS at the time the CVE was created but are 
known to be affected: from 8.5.0 through 8.5.100, from 7.0.43 through 7.0.109. Other unsupported versions may also be affected.




Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
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