CVE-2026-92066 Firefox - Sandbox Escape

Firefox contains a sandbox escape caused by a vulnerability in the Profile Backup component, letting attackers escape sandbox restrictions, exploit requires unspecified conditions.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
EPSS
0.55% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Sandbox Escape
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
15 September 2026
Updated
15 October 2026
Weakness
CWE-693

Vendor fix

Update to Firefox 156 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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