Main Vulnerability Database Vulnerabilities #VU144097

Improper access control in Mozilla Firefox and Firefox for Android - CVE-2026-75874

Published: August 18, 2026

Vulnerability identifier: #VU144097

CSH Severity: High

CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-75874

CWE-ID: CWE-284

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to escape the sandbox.

The vulnerability exists due to improper isolation in the Remote Settings Client component when handling remote settings data. A remote attacker can trigger the vulnerable component to escape the sandbox.

Affected software

Mozilla Firefox
Firefox for Android

How to mitigate CVE-2026-75874

Install security update from vendor's website.

Mozilla Firefox - update to 154.0
Firefox for Android - update to 154.0

External References

Related Security Bulletins