{"id":"CVE-2026-109750","title":"Site isolation issue in the DOM: Web Authentication component","summary":"Site isolation issue in the DOM: Web Authentication component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.","severity":"critical","published":"2026-10-13","updated":"2026-10-13","sourceUpdated":"2026-10-13T19:18:39.180","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-109750","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2067571","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":"2026-10-13T13:27:04.007Z","vendor":"Mozilla","product":"Firefox","affected":["Firefox","Thunderbird"],"epss":0.0038,"epssPercentile":0.31813,"cvss":9.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-19T20:37:17.777350Z"},"cvssSource":"adp","slug":"CVE-2026-109750","body":"## Overview\n\nSite isolation issue in the DOM: Web Authentication 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":"midnight","depthScore":53,"depthScoreParts":{"impact":52.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":225254,"id":"CVE-2026-109750","ts":1792446387593,"field":"cvss","old":null,"new":"9.6"},{"seq":225253,"id":"CVE-2026-109750","ts":1792446387593,"field":"severity","old":"none","new":"critical"}]}