Improper Restriction of Rendered UI Layers or Frames in Mozilla Firefox and Firefox for Android - CVE-2026-12322
Published: June 16, 2026
Vulnerability identifier: #VU134644
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-12322
CWE-ID: CWE-1021
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform clickjacking.
The vulnerability exists due to improper UI restriction in the Widget: Gtk component when rendering interface elements. A remote attacker can present crafted interface content to perform clickjacking.
Affected software
Mozilla Firefox
Firefox for Android
Mozilla Thunderbird
Firefox for Android
Mozilla Thunderbird
How to mitigate CVE-2026-12322
Install security update from vendor's website.
Mozilla Firefox - update to 152.0
Firefox for Android - update to 152.0
Mozilla Thunderbird - update to 152.0
Firefox for Android - update to 152.0
Mozilla Thunderbird - update to 152.0