{"id":"CVE-2026-76183","title":"Authentication Bypass by Alternate Name vulnerability in Apache Tomcat allowed the security constraints for any WebSocket endpoint to be bypassed.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 throug…","summary":"Authentication Bypass by Alternate Name vulnerability in Apache Tomcat allowed the security constraints for any WebSocket endpoint to be bypassed.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 throug…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-289"],"vendor":"Apache Software Foundation","product":"Apache Tomcat","affected":["apache_tomcat >= 11.0.0-M1 <= 11.0.25","apache_tomcat >= 10.1.0-M1 <= 10.1.59","apache_tomcat >= 9.0.0.M1 <= 9.0.121","apache_tomcat >= 8.5.0 <= 8.5.100","apache_tomcat >= 7.0.43 <= 7.0.109"],"patched":["hardened_images"],"published":"2026-09-23","updated":"2026-09-30","sourceUpdated":"2026-09-30T15:22:34.470","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-76183","references":[{"url":"https://lists.apache.org/thread/45mxk8nj2q8pkhct6lfxkvtm2jpywrsp","label":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/09/23/21","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76183.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-76183"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2539355"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-76183"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76183"},{"url":"https://access.redhat.com/errata/RHSA-2026:68257"},{"url":"https://access.redhat.com/errata/RHSA-2026:68258"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute","exploit-available"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-23T15:33:34.949308Z"},"epss":0.00566,"epssPercentile":0.46821,"scores":{"nvd":9.8,"vendor":7.4,"adp":9.8},"ingestedAt":"2026-09-23T11:22:32.916Z","exploits":{"github":1,"githubRepos":["https://github.com/Ethen1212/tomcat-CVE-2026-76183"],"checkedAt":"2026-10-27T19:12:25.822Z"},"exploitAvailable":true,"slug":"CVE-2026-76183","body":"## Overview\n\nAuthentication Bypass by Alternate Name vulnerability in Apache Tomcat allowed the security constraints for any WebSocket endpoint to be bypassed.\n\n\n\nThis 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.\n\n\n\nThe following versions were EOS at the time the CVE was created but are \nknown 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.\n\n\n\n\nUsers are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:68257** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68257)\n- **RHSA-2026:68258** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68258)\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat JBoss Web Server 5, Red Hat JBoss Web Server 6, … · no fix planned: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat JBoss Web Server 5, … · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-76183.json)","depth":"abyssal","depthScore":66,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":229105,"id":"CVE-2026-76183","ts":1792929447191,"field":"exploit_available","old":"false","new":"true"},{"seq":209765,"id":"CVE-2026-76183","ts":1790180879941,"field":"cvss","old":null,"new":"9.8"},{"seq":209764,"id":"CVE-2026-76183","ts":1790180879941,"field":"severity","old":"none","new":"critical"}]}