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 v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-12322
CWE-ID: CWE-1021
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mozilla
Affected software:
Mozilla Firefox
Firefox for Android
Mozilla Firefox
Firefox for Android
Detailed vulnerability description
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.
How to mitigate CVE-2026-12322
Install security update from vendor's website.