{"id":"CVE-2026-100800","title":"Sandbox escape due to use-after-free in the Disability Access APIs component","summary":"Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and 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","CWE-825"],"vendor":"Mozilla","product":"Firefox","affected":["Firefox"],"published":"2026-09-29","updated":"2026-09-30","sourceUpdated":"2026-09-30T18:18:09.063","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-100800","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=2056767","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-100/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-101/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-103/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-97/","label":"security@mozilla.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100800.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-100800"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2543171"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-100800"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-100800"},{"url":"https://www.mozilla.org/security/advisories/mfsa2026-97/#CVE-2026-100800"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00292,"epssPercentile":0.21642,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-09-29T14:32:31.208813Z"},"ingestedAt":"2026-09-29T13:34:31.669Z","scores":{"nvd":9.6,"vendor":6.1},"slug":"CVE-2026-100800","body":"## Overview\n\nSandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-100800.json)","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":52.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":212803,"id":"CVE-2026-100800","ts":1790700047359,"field":"cvss","old":null,"new":"9.6"},{"seq":212802,"id":"CVE-2026-100800","ts":1790700047359,"field":"severity","old":"none","new":"critical"}]}