Main Vulnerability Database Vulnerabilities #VU123686

Protection mechanism failure in Mozilla Firefox and Firefox for Android - CVE-2026-3846

Published: March 10, 2026

Vulnerability identifier: #VU123686

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:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-3846

CWE-ID: CWE-693

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to insufficient implementation of security measures in the CSS Parsing and Computation component. A remote attacker can trick he victim into visiting a specially crafted website and bypass same-origin policy restrictions.

Affected software

Mozilla Firefox
Firefox for Android

How to mitigate CVE-2026-3846

Install updates from vendor's website.

Mozilla Firefox - update to 148.0.2
Firefox for Android - update to 148.0.2

External References

Related Security Bulletins