Protection mechanism failure in Mozilla Firefox and Firefox for Android - CVE-2026-8401
Published: May 18, 2026
Vulnerability identifier: #VU131768
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-8401
CWE-ID: CWE-693
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mozilla
Affected software:
Mozilla Firefox
Firefox for Android
Mozilla Firefox
Firefox for Android
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient implementation of security measures in the Profile Backup component. An attacker can trick the victim into visiting a specially crafted website and bypass sandbox restrictions, leading to remote code execution.
How to mitigate CVE-2026-8401
Install updates from vendor's website.