#VU121216 Improper Restriction of Rendered UI Layers or Frames in Mozilla products - CVE-2026-0887
Published: January 13, 2026
Vulnerability identifier: #VU121216
Vulnerability risk: Medium
CVSSv4.0: 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/E:U/U:Green
CVE-ID: CVE-2026-0887
CWE-ID: CWE-1021
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Mozilla Firefox
Firefox ESR
Firefox for Android
Mozilla Firefox
Firefox ESR
Firefox for Android
Software vendor:
Mozilla
Mozilla
Description
The vulnerability allows a remote attacker to perform clickjacking attacks.
The vulnerability exists due to an error in the PDF Viewer. A remote attacker can trick the victim into opening a specially crafted URL and gain access to sensitive information or perform clickjacking attack.
Remediation
Install updates from vendor's website.