Insufficient UI Warning of Dangerous Operations in Firefox for Android and Mozilla Firefox - CVE-2025-1018

Vulnerability identifier: #VU103612

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-2025-1018

CWE-ID: CWE-357

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to fullscreen notification is prematurely hidden when fullscreen is re-requested quickly by the user. A remote attacker can perform spoofing attack.

Firefox for Android
Mozilla Firefox
Ubuntu
Mozilla Thunderbird
firefox (Ubuntu package)
thunderbird (Ubuntu package)

Install updates from vendor's website.

Firefox for Android - update to 135.0
Mozilla Firefox - update to 135.0
Mozilla Thunderbird - update to 135.0
firefox (Ubuntu package) - update to 135.0+build2-0ubuntu0.20.04.1
thunderbird (Ubuntu package) - update to 1:140.7.1+build1-0ubuntu0.22.04.1

• https://www.mozilla.org/en-US/security/advisories/mfsa2025-07/

• Multiple vulnerabilities in Mozilla Firefox and Firefox ESR
• Multiple vulnerabilities in Mozilla Thunderbird
• Ubuntu update for firefox
• Ubuntu update for thunderbird