by Kastro
Paper/Archive/CVE-2026-100800

CVE-2026-100800

Mozilla Firefox — Sandbox escape due to use-after-free in the Disability Access APIs component

EPSS 0.3%CVSS 9.6
critical.is priorityof 100
33
CVSS 9.6 (ADP)9.6 / 10 × 3028.8Not in CISA KEV+300.0EPSS percentile 21.8.218 × 204.4No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Firefoxsee advisory153.4CNA
Thunderbirdsee advisory153.4CNA

Scores by source

CISA ADP9.6CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refbugzilla.mozilla.org/show_bug.cgi?id=2056767refmozilla.org/security/advisories/mfsa2026-100refmozilla.org/security/advisories/mfsa2026-101refmozilla.org/security/advisories/mfsa2026-103refmozilla.org/security/advisories/mfsa2026-97