by Kastro
Paper/Archive/CVE-2026-92048

CVE-2026-92048

Mozilla Firefox — Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component

EPSS 0.3%CVSS 9.0
critical.is priorityof 100
31
CVSS 9.0 (ADP)9.0 / 10 × 3027.0Not in CISA KEV+300.0EPSS percentile 20.8.208 × 204.2No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

Affected

ProductAffectedFixed inSource
Firefoxsee advisory153.3CNA
Thunderbirdsee advisory153.3CNA

Scores by source

CISA ADP9.0CVSS:3.1/AV:N/AC:L/PR:L/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=2061235refmozilla.org/security/advisories/mfsa2026-90refmozilla.org/security/advisories/mfsa2026-93refmozilla.org/security/advisories/mfsa2026-94refmozilla.org/security/advisories/mfsa2026-96