Critical [CVE-2026-76183] Apache Tomcat: Bypass of security constraints for WebSocket endpoints
This critical-severity Apache Software Foundation advisory covers CVE-2026-76183 affecting Apache Tomcat.
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Summary
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.
- Apache Tomcat 11.0.0-M1 through 11.0.25
- Apache Tomcat 10.1.0-M1 through 10.1.59
- Apache Tomcat 9.0.0.M1 through 9.0.121
- Apache Tomcat 8.5.0 through 8.5.100
- Apache Tomcat 7.0.43 through 7.0.109
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
- 11.0.26
- 10.1.60
- 9.0.122
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Mitigation checklist
- Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
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