Paper/Archive/CVE-2026-92066

CVE-2026-92066

Mozilla Firefox — Sandbox escape in the Profile Backup component

EPSS 0.6%CVSS 9.8

critical.is priorityof 100

39

CVSS 9.8 (ADP)9.8 / 10 × 3029.4 Not in CISA KEV+300.0 EPSS percentile 46.1.461 × 209.2 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.

Affected

ProductAffectedFixed inSource

Firefoxsee advisory156CNA

Thunderbirdsee advisory156CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refbugzilla.mozilla.org/show_bug.cgi?id=2058093 refmozilla.org/security/advisories/mfsa2026-90 refmozilla.org/security/advisories/mfsa2026-94