Protection mechanism failure in Mozilla Firefox and Firefox for Android - CVE-2026-124923
Published: November 10, 2026
Vulnerability identifier: #VU164579
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-124923
CWE-ID: CWE-693
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to escape browser sandbox restrictions.
The vulnerability exists due to inadequate sandbox enforcement in Firefox's Agent component when handling component operations. A remote attacker can trigger crafted operations to bypass sandbox boundaries.
Affected software
Mozilla Firefox
Firefox for Android
Firefox for Android
How to mitigate CVE-2026-124923
Install security update from vendor's website.
Mozilla Firefox - update to 160.0
Firefox for Android - update to 160.0
Firefox for Android - update to 160.0