{"id":"CVE-2026-100831","title":"Use-after-free in the DOM: UI Events & Focus Handling component","summary":"Use-after-free in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.","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-416"],"vendor":"Mozilla","product":"Firefox","affected":["Firefox"],"published":"2026-09-29","updated":"2026-09-29","sourceUpdated":"2026-09-29T14:17:18.357","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100831","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2067172","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-100/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-97/","label":"security@mozilla.org"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-29T13:12:18.595259Z"},"ingestedAt":"2026-09-29T13:34:31.680Z","slug":"CVE-2026-100831","body":"## Overview\n\nUse-after-free in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}