Protection mechanism failure in Firefox for Android and Mozilla Firefox - CVE-2026-92066
Published: September 15, 2026
Vulnerability identifier: #VU150108
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-92066
CWE-ID: CWE-693
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to escape the browser sandbox.
The vulnerability exists due to an unspecified security flaw in the Profile Backup component when handling profile backups. A remote attacker can trigger the flaw to escape the browser sandbox.
Affected software
Firefox for Android
Mozilla Firefox
Mozilla Firefox
How to mitigate CVE-2026-92066
Install security update from vendor's website.
Firefox for Android - update to 156.0
Mozilla Firefox - update to 156.0
Mozilla Firefox - update to 156.0