{"schema":"threatline.record/2","record":{"id":"CVE-2026-109739","aliases":[],"summary":"Privilege escalation in the WebExtensions component","details":"Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.","categories":["Applications & CMS"],"product":"Firefox","vendor":"Mozilla","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-109739","source_modified_at":"2026-10-14T15:56:49.230Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"Firefox","vendor":"Mozilla","versions":[{"status":"unaffected","version":"158","lessThanOrEqual":"*","versionType":"rpm"}],"defaultStatus":null},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-109739","source_modified_at":"2026-10-14T15:56:49.230Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"Thunderbird","vendor":"Mozilla","versions":[{"status":"unaffected","version":"158","lessThanOrEqual":"*","versionType":"rpm"}],"defaultStatus":null}],"fixed_versions":[],"cvss":8.8,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00369,"percentile":0.29591,"score_date":"2026-10-23"},"published_at":"2026-10-13T12:29:25.890Z","modified_at":"2026-10-14T15:56:49.230Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-109739","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-14T15:56:49.230Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-109739","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=2049069"},{"source":"CVE List","url":"https://www.mozilla.org/security/advisories/mfsa2026-106/"},{"source":"CVE List","url":"https://www.mozilla.org/security/advisories/mfsa2026-109/"}],"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":"2026-10-14T03:59:06.635051Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-14T15:56:49.230Z","content_hash":"730c0b69fbe07c7c9541a389713079ae9a8f356734c1cacb9fc18b7b95a157e7"}}