Input validation error in Mozilla products - CVE-2026-124891
Published: November 10, 2026
Vulnerability identifier: #VU164534
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-124891
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to trigger incorrect handling of boundary cases, potentially disrupting document selection processing.
The vulnerability exists due to incorrect boundary conditions in the DOM: Selection component when processing document selections. A remote attacker can trigger an incorrectly handled selection boundary case to potentially disrupt browser operation.
Affected software
Firefox ESR
Mozilla Firefox
Firefox for Android
Mozilla Firefox
Firefox for Android
How to mitigate CVE-2026-124891
Install security update from vendor's website.
Firefox ESR - update to 153.7.0
Firefox for Android - update to 160.0
Mozilla Firefox - update to 160.0
Firefox for Android - update to 160.0
Mozilla Firefox - update to 160.0