CVE-2026-76183criticalCWE-289

CVE-2026-76183: critical vulnerability in Apache Tomcat

Apache Tomcat: Bypass of security constraints for WebSocket endpoints

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48Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 9.8epss 0.6%
from disclosure to weapon30 days
Published on NVDSep 23
1st PoC+30d
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
Apache Software Foundation · Apache Tomcat
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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