{"id":"CVE-2026-109746","title":"Mitigation bypass in the DOM: Security component","summary":"Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.","severity":"high","published":"2026-10-13","updated":"2026-10-13","sourceUpdated":"2026-10-13T19:18:38.723","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109746","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2063005","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-106/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-109/","label":"security@mozilla.org"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-13T13:27:04.005Z","vendor":"Mozilla","product":"Firefox","affected":["Firefox","Thunderbird"],"epss":0.003,"epssPercentile":0.22516,"cvss":7.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-19T12:21:04.583316Z"},"cvssSource":"adp","slug":"CVE-2026-109746","body":"## Overview\n\nMitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":40.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":224946,"id":"CVE-2026-109746","ts":1792416584967,"field":"cvss","old":null,"new":"7.3"},{"seq":224945,"id":"CVE-2026-109746","ts":1792416584967,"field":"severity","old":"none","new":"high"}]}