{"id":"CVE-2026-100804","title":"Sandbox escape due to use-after-free in the Preferences: Backend component","summary":"Sandbox escape due to use-after-free in the Preferences: Backend component. This vulnerability was fixed in Firefox 157.","severity":"critical","cvss":9.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H","cwe":["CWE-416"],"vendor":"Mozilla","product":"Firefox","affected":["Firefox"],"published":"2026-09-29","updated":"2026-09-30","sourceUpdated":"2026-09-30T04:18:14.320","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100804","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2058647","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-97/","label":"security@mozilla.org"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-29T14:28:13.785043Z"},"ingestedAt":"2026-09-29T13:34:31.670Z","slug":"CVE-2026-100804","body":"## Overview\n\nSandbox escape due to use-after-free in the Preferences: Backend component. This vulnerability was fixed in Firefox 157.\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,"exploitation":0,"ransomware":0},"changes":[{"seq":212805,"id":"CVE-2026-100804","ts":1790700047571,"field":"cvss","old":null,"new":"9.6"},{"seq":212804,"id":"CVE-2026-100804","ts":1790700047571,"field":"severity","old":"none","new":"critical"}]}