CVE-2026-76183

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.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://lists.apache.org/thread/45mxk8nj2q8pkhct6lfxkvtm2jpywrsp
http://www.openwall.com/lists/oss-security/2026/09/23/21

Configurations

No configuration.

History

23 Sep 2026, 19:19

Type	Values Removed	Values Added
References		() http://www.openwall.com/lists/oss-security/2026/09/23/21 -

23 Sep 2026, 16:16

Type	Values Removed	Values Added
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 9.8

23 Sep 2026, 12:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-23 12:17

Updated : 2026-09-30 15:22

NVD link : CVE-2026-76183

Mitre link : CVE-2026-76183

CVE.ORG link : CVE-2026-76183

JSON object : View

Products Affected

No product.

CWE

CWE-289

Authentication Bypass by Alternate Name

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