#VU105322 Improper Restriction of Rendered UI Layers or Frames in Firefox for Android - CVE-2025-1940

Vulnerability identifier: #VU105322

Vulnerability risk: High

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2025-1940

CWE-ID: CWE-1021

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Firefox for Android
Mobile applications / Apps for mobile phones

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to perform tapjacking attacks.

The vulnerability exists due to a select option can partially obscure the confirmation prompt shown before launching external apps. This could be used to trick a user in to launching an external app unexpectedly.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Firefox for Android: 130.0 - 135.0.1

---

External links
https://www.mozilla.org/en-US/security/advisories/mfsa2025-14/
https://bugzilla.mozilla.org/show_bug.cgi?id=1908488

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.