{"affected":[{"product":"Firefox","source":"CNA: mozilla","vendor":"Mozilla","versions":[{"lessThanOrEqual":"153.*","status":"unaffected","version":"153.6","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"159","versionType":"rpm"}]},{"product":"Thunderbird","source":"CNA: mozilla","vendor":"Mozilla","versions":[{"lessThanOrEqual":"153.*","status":"unaffected","version":"153.6","versionType":"rpm"},{"lessThanOrEqual":"*","status":"unaffected","version":"159","versionType":"rpm"}]}],"cveId":"CVE-2026-117997","cwes":["CWE-416"],"description":"Sandbox escape due to use-after-free in the Widget component. This vulnerability was fixed in Firefox 159, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.","epss":{"date":"2026-11-05","percentile":0.07791,"score":0.00181},"exploits":[],"kev":null,"metrics":[{"score":9.6,"severity":"critical","source":"ADP: CISA-ADP","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","version":"3.1"},{"score":9.6,"severity":"critical","source":"NVD: 134c704f-9b21-4f2e-91b3-4a467353bcc0","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","version":"3.1"}],"modifiedAt":1793899068070,"publishedAt":1793109954821,"references":[{"source":"CNA: mozilla","tags":[],"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2081560"},{"source":"CNA: mozilla","tags":[],"url":"https://www.mozilla.org/security/advisories/mfsa2026-118/"},{"source":"CNA: mozilla","tags":[],"url":"https://www.mozilla.org/security/advisories/mfsa2026-120/"},{"source":"CNA: mozilla","tags":[],"url":"https://www.mozilla.org/security/advisories/mfsa2026-121/"},{"source":"CNA: mozilla","tags":[],"url":"https://www.mozilla.org/security/advisories/mfsa2026-122/"},{"source":"security@mozilla.org","tags":[],"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2081560"},{"source":"security@mozilla.org","tags":[],"url":"https://www.mozilla.org/security/advisories/mfsa2026-118/"},{"source":"security@mozilla.org","tags":[],"url":"https://www.mozilla.org/security/advisories/mfsa2026-120/"},{"source":"security@mozilla.org","tags":[],"url":"https://www.mozilla.org/security/advisories/mfsa2026-121/"},{"source":"security@mozilla.org","tags":[],"url":"https://www.mozilla.org/security/advisories/mfsa2026-122/"}],"remediation":[],"revision":"ce5b85aca2a4c130fdf91fa1caf11c5c254d8557e355bca48c91ea850763f1a9","sources":[{"modifiedAt":1793897287849,"name":"CNA: mozilla","retrievedAt":1793898699328,"url":"https://www.cve.org/CVERecord?id=CVE-2026-117997"},{"modifiedAt":1793899068070,"name":"NVD","retrievedAt":1793902922464,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-117997"},{"modifiedAt":null,"name":"FIRST EPSS","retrievedAt":1793898715079,"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-117997"}],"ssvc":{"assessedAt":1793897264239,"automatable":"no","exploitation":"none","source":"ADP: CISA-ADP","technicalImpact":"total"},"status":"published","title":"Sandbox escape due to use-after-free in the Widget component","updatedAt":1793902922464}