{"id":"CVE-2026-92039","title":"Mitigation bypass in the DOM: Notifications component","summary":"Mitigation bypass in the DOM: Notifications component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.","severity":"medium","cvss":6.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L","cwe":["CWE-693","CWE-358"],"vendor":"Mozilla","product":"Firefox","affected":["Firefox","Thunderbird"],"published":"2026-09-15","updated":"2026-09-21","sourceUpdated":"2026-09-21T18:17:12.660","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92039","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2001265","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-93/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-94/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-96/","label":"security@mozilla.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92039.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-92039"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533735"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-92039"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92039"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-90/#CVE-2026-92039"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-94/#CVE-2026-92039"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00159,"epssPercentile":0.05517,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-21T17:26:42.531054Z"},"scores":{"nvd":6.3,"vendor":6.1,"adp":6.3},"ingestedAt":"2026-09-15T12:36:50.187Z","slug":"CVE-2026-92039","body":"## Overview\n\nMitigation bypass in the DOM: Notifications component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, 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** · Moderate · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-92039.json)","depth":"sunlit","depthScore":35,"depthScoreParts":{"impact":34.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":208661,"id":"CVE-2026-92039","ts":1790016691879,"field":"cvss","old":"6.1","new":"6.3"},{"seq":207022,"id":"CVE-2026-92039","ts":1789749741215,"field":"cvss","old":null,"new":"6.1"},{"seq":207021,"id":"CVE-2026-92039","ts":1789749741215,"field":"severity","old":"none","new":"medium"}]}