CVE-2026-45150 MEDIUM

CVE-2026-45150: Zen Browser - Missing Fullscreen Security Notification Allows Origin Spoofing

Vendor Zen-Browser
Product desktop
Weakness CWE-451
Published July 15, 2026
Last update July 15, 2026
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CVSS base score

6.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction —
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

What the vulnerability does

01Description

Zen is a firefox-based browser. Prior to 1.19.13b, Zen Browser did not provide a persistent, clearly visible security notification when a webpage entered fullscreen mode, allowing an attacker-controlled page to hide the real browser UI and origin information, imitate a trusted website UI, and combine with long-domain URL eliding to spoof a trusted origin for phishing and credential theft. This issue is fixed in version 1.19.13b.

Key dates

02Disclosure timeline

July 15, 2026 CVE published
July 15, 2026 Record updated