CVE-2026-45150

MEDIUM

Zen Browser - Missing Fullscreen Security Notification Allows Origin Spoofing

Title source: cna
STIX 2.1

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.

References (1)

Core 1
Core References

Scores

CVSS v4 6.3
EPSS 0.0025
EPSS Percentile 16.8%
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-451
Status published
Products (1)
zen-browser/desktop < 1.19.13b
Published Jul 15, 2026
Tracked Since Jul 15, 2026