{"id":"CVE-2026-109780","aliases":[],"cve":{"records":[{"id":"CVE-2026-109780","source":"mozilla","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-13T00:49:15.410Z","published":"2026-10-13T12:29:35.608Z","modified":"2026-10-26T19:41:10.838Z"}],"publishers":[{"name":"mozilla","role":"CNA","organizationId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","modified":"2026-10-13T18:08:36.500Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-26T19:41:10.838Z"}],"references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2072775","tags":[],"source":"mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-106/","tags":[],"source":"mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-109/","tags":[],"source":"mozilla"}],"weaknesses":[{"id":"CWE-693","description":"CWE-693 Protection Mechanism Failure","source":"CISA-ADP"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-26T19:21:41.229525Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"yes"},{"name":"Technical Impact","value":"total"}]}]},"title":"Mitigation bypass in the DOM: Core & HTML component","titleSource":"mozilla","descriptionSource":"mozilla","description":"Mitigation bypass in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.","score":9.8,"severity":"critical","published":"2026-10-13T12:29:35.608Z","modified":"2026-10-26T19:41:10.838Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Mozilla","name":"Firefox","platforms":[],"versions":[{"version":"158","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}],"cpes":[],"source":"mozilla","url":"https://www.cve.org/CVERecord?id=CVE-2026-109780"},{"vendor":"Mozilla","name":"Thunderbird","platforms":[],"versions":[{"version":"158","status":"unaffected","lessThanOrEqual":"*","versionType":"rpm"}],"cpes":[],"source":"mozilla","url":"https://www.cve.org/CVERecord?id=CVE-2026-109780"}],"remediation":[],"references":["https://bugzilla.mozilla.org/show_bug.cgi?id=2072775","https://www.mozilla.org/security/advisories/mfsa2026-106/","https://www.mozilla.org/security/advisories/mfsa2026-109/"],"sources":[{"name":"CVE","id":"CVE-2026-109780","modified":"2026-10-26T19:41:10.838Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-109780"}],"assessments":[{"source":"CISA-ADP","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8}],"sourceAffected":[],"observedAt":"2026-10-29T14:29:28.050Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T16:25:31.632Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":{"text":"A mitigation bypass vulnerability in the DOM: Core & HTML component affects Firefox and Thunderbird, fixed in version 158. The weakness is a protection mechanism failure.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T08:42:05.627Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-109780"}]}}