{"schema":"threatline.record/2","record":{"id":"CVE-2026-100831","aliases":[],"summary":"Use-after-free in the DOM: UI Events & Focus Handling component","details":"Use-after-free in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.","categories":["Applications & CMS"],"product":"Firefox","vendor":"Mozilla","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-100831","source_modified_at":"2026-09-30T17:21:15.823Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"Firefox","vendor":"Mozilla","versions":[{"status":"unaffected","version":"153.4","lessThanOrEqual":"153.*","versionType":"rpm"},{"status":"unaffected","version":"157","lessThanOrEqual":"*","versionType":"rpm"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-100831","source_modified_at":"2026-09-30T17:21:15.823Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"Thunderbird","vendor":"Mozilla","versions":[{"status":"unaffected","version":"153.4","lessThanOrEqual":"153.*","versionType":"rpm"},{"status":"unaffected","version":"157","lessThanOrEqual":"*","versionType":"rpm"}],"defaultStatus":null}],"fixed_versions":[],"cvss":8.8,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00237,"percentile":0.13966,"score_date":"2026-10-23"},"published_at":"2026-09-29T12:36:35.297Z","modified_at":"2026-09-30T17:21:15.823Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-100831","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-30T17:21:15.823Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-100831","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2067172"},{"source":"CVE List","url":"https://www.mozilla.org/security/advisories/mfsa2026-100/"},{"source":"CVE List","url":"https://www.mozilla.org/security/advisories/mfsa2026-101/"},{"source":"CVE List","url":"https://www.mozilla.org/security/advisories/mfsa2026-103/"},{"source":"CVE List","url":"https://www.mozilla.org/security/advisories/mfsa2026-97/"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"total","assessed_at":"2026-09-29T13:12:18.595259Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-09-30T17:21:15.823Z","content_hash":"a71b7be60e66761fa9bdc6d2c8d29f505f803650f13b6f957f362b8e44e72bae"}}