#VU124293 Out-of-bounds write in Mozilla products - CVE-2026-4687
Published: March 24, 2026
Vulnerability identifier: #VU124293
Vulnerability risk: High
CVSSv4.0: 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-2026-4687
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Mozilla Firefox
Firefox ESR
Firefox for Android
Mozilla Firefox
Firefox ESR
Firefox for Android
Software vendor:
Mozilla
Mozilla
Description
The vulnerability allows a remote attacker to escape the sandbox.
The vulnerability exists due to incorrect boundary conditions in the Telemetry component when handling telemetry data. A remote attacker can trick the victim into visiting a specially crafted website and escape the sandbox.
Successful exploitation could allow an attacker to execute code outside the browser's sandbox with elevated privileges.
Remediation
Install security update from vendor's website.