{"id":"CVE-2026-92012","title":"Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component","summary":"Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwe":["CWE-120","CWE-266"],"vendor":"Mozilla","product":"Firefox","affected":["Firefox","Thunderbird"],"published":"2026-09-15","updated":"2026-09-16","sourceUpdated":"2026-09-16T19:34:05.910","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92012","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2058069","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-91/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-92/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-93/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-94/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-95/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-96/","label":"security@mozilla.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92012.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-92012"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533769"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-92012"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92012"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-92/#CVE-2026-92012"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-95/#CVE-2026-92012"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-15T13:40:54.311523Z"},"ingestedAt":"2026-09-15T12:36:50.198Z","scores":{"nvd":8.8,"vendor":7.5},"epss":0.00276,"epssPercentile":0.20171,"slug":"CVE-2026-92012","body":"## Overview\n\nPrivilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, … · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92012.json)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":203681,"id":"CVE-2026-92012","ts":1789483135053,"field":"cvss","old":null,"new":"8.8"},{"seq":203680,"id":"CVE-2026-92012","ts":1789483135053,"field":"severity","old":"none","new":"high"}]}