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.
History

Tue, 29 Sep 2026 13:15:00 +0000

Type Values Removed Values Added
First Time appeared Redhat
Redhat hummingbird
CPEs cpe:/a:redhat:hummingbird:1
Vendors & Products Redhat
Redhat hummingbird
References
Metrics threat_severity

None

threat_severity

Important


Wed, 23 Sep 2026 19:30:00 +0000

Type Values Removed Values Added
References

Wed, 23 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 23 Sep 2026 14:45:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache tomcat
Vendors & Products Apache
Apache tomcat

Wed, 23 Sep 2026 11:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Apache Tomcat: Bypass of security constraints for WebSocket endpoints
Weaknesses CWE-289
References

cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published: 2026-09-23T11:16:09.907Z

Updated: 2026-09-30T14:54:21.515Z

Reserved: 2026-08-19T10:37:56.319Z

Link: CVE-2026-76183

cve-icon Vulnrichment

Updated: 2026-09-23T18:10:41.803Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-23T12:17:06.537

Modified: 2026-09-30T15:22:34.470

Link: CVE-2026-76183

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-23T11:16:09Z

Links: CVE-2026-76183 - Bugzilla