CVE-2026-92066CWE-693

CVE-2026-92066

Critical · published September 15, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
45.3
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00551 · 45.3th percentile
Weakness
CWE-693 · Protection Mechanism Failure
Published
2026-09-15T17:17Z
Affected products (2)
ProductVersionsFixed in
mozilla/firefox< 156.0.0156.0.0
mozilla/thunderbird< 156.0156.0
References (3)
https://bugzilla.mozilla.org/show_bug.cgi?id=2058093 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-90/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-94/ · [email protected]
EPSS history
Timeline
  • 17 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 15 SEP 12:34Z
    Sandbox escape in the Profile Backup component
    cvelistv5