Protection mechanism failure in Mozilla products - CVE-2026-92018
Published: September 15, 2026
Vulnerability identifier: #VU150044
CSH Severity: High
CVSS v4: 8.6 [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]
CVE-ID: CVE-2026-92018
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 improper sandbox isolation in the DOM: Core & HTML component when processing web content. A remote attacker can trick the victim into visiting a specially crafted website to escape the browser sandbox.
User interaction is required to visit the crafted website.
Affected software
Mozilla Firefox
Firefox ESR
Firefox for Android
Firefox ESR
Firefox for Android
How to mitigate CVE-2026-92018
Install security update from vendor's website.
Mozilla Firefox - update to 156.0
Firefox for Android - update to 156.0
Firefox ESR - addressed in versions 115.41.0, 140.16.0, 153.3.0
Firefox for Android - update to 156.0
Firefox ESR - addressed in versions 115.41.0, 140.16.0, 153.3.0