CVE-2026-45150 Zen Browser - Missing Fullscreen Security Notification Allows Origin Spoofing
Attackers can spoof trusted origins via fullscreen UI hiding, enabling phishing and credential theft in Zen Browser.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-45150?
CVE-2026-45150 is a medium-severity vulnerability in zen-browser desktop, published on 15 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-451
Which versions are affected by CVE-2026-45150?
How do I fix CVE-2026-45150?
No fix has been published for CVE-2026-45150 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-45150 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45150 exists.
Sources
Also known as GHSA-vjfv-85qf-v25c.