CVE-2026-76183 PUBLISHED

Apache Tomcat: Bypass of security constraints for WebSocket endpoints

Assigner: apache
Reserved: 19.08.2026 Published: 23.09.2026 Updated: 23.09.2026

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.

Product Status

Vendor Apache Software Foundation
Product Apache Tomcat
Versions Default: unaffected
  • affected from 11.0.0-M1 to 11.0.25 (incl.)
  • affected from 10.1.0-M1 to 10.1.59 (incl.)
  • affected from 9.0.0.M1 to 9.0.121 (incl.)
  • affected from 8.5.0 to 8.5.100 (incl.)
  • affected from 7.0.43 to 7.0.109 (incl.)
  • affected from 0 to 7.0.43 (excl.)

Credits

  • Zhang Yilin finder

References

Problem Types

  • CWE-289 Authentication Bypass by Alternate Name CWE