Main Vulnerability Database Vulnerabilities #VU123239

Time-of-check Time-of-use (TOCTOU) Race Condition in Firefox for Android and Mozilla Firefox - CVE-2026-2802

Published: February 25, 2026

Vulnerability identifier: #VU123239

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-2026-2802

CWE-ID: CWE-367

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 a race condition in the JavaScript: GC component. A remote attacker can bypass implemented security restrictions.

Firefox for Android
Mozilla Firefox
Mozilla Thunderbird

Install updates from vendor's website.

Firefox for Android - update to 148.0
Mozilla Firefox - update to 148.0
Mozilla Thunderbird - update to 148.0