{"id":"CVE-2026-92018","title":"Sandbox escape in the DOM: Core & HTML component","summary":"Sandbox escape in the DOM: Core & HTML 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.","severity":"critical","cvss":9.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","cwe":["CWE-693","CWE-791"],"vendor":"Mozilla","product":"Firefox","affected":["Firefox","Thunderbird"],"published":"2026-09-15","updated":"2026-09-20","sourceUpdated":"2026-09-20T01:16:34.680","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-92018","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2064287","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-2026-92018.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-92018"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533773"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-92018"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92018"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-92/#CVE-2026-92018"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-95/#CVE-2026-92018"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-20T00:15:46.393813Z"},"epss":0.0035,"epssPercentile":0.28612,"scores":{"nvd":9.6,"vendor":7.5,"adp":9.6},"ingestedAt":"2026-09-15T12:36:50.194Z","slug":"CVE-2026-92018","body":"## Overview\n\nSandbox escape in the DOM: Core & HTML 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-2026-92018.json)","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":52.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":207867,"id":"CVE-2026-92018","ts":1789870390463,"field":"cvss","old":"7.5","new":"9.6"},{"seq":207866,"id":"CVE-2026-92018","ts":1789870390463,"field":"severity","old":"high","new":"critical"},{"seq":206400,"id":"CVE-2026-92018","ts":1789663224612,"field":"cvss","old":null,"new":"7.5"},{"seq":206399,"id":"CVE-2026-92018","ts":1789663224612,"field":"severity","old":"none","new":"high"}]}