Main Vulnerability Database Vulnerabilities #VU146634

Input validation error in Mozilla Firefox and Firefox for Android - CVE-2026-84134

Published: September 1, 2026

Vulnerability identifier: #VU146634

CSH Severity: Low

CVSS v4: 2.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-84134

CWE-ID: CWE-20

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 an unspecified error in the profile backup component. A remote attacker can bypass implemented security restrictions.

Mozilla Firefox
Firefox for Android

Install updates from vendor's website.

Mozilla Firefox - update to 155.0
Firefox for Android - update to 155.0