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

Quick assessment

Affected
zen-browser desktop
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

zen-browser desktop是zen-browser的台式机。 zen-browser desktop 1.19.13b之前版本存在处理逻辑错误漏洞，该漏洞源于全屏模式下未提供持续、清晰可见的安全通知，导致攻击者控制的页面可隐藏真实浏览器界面和源信息，模仿可信网站界面，并结合长域名URL截断伪造可信源，用于网络钓鱼和凭据窃取。

AI Predicted 5.3 Difficulty: Easy EPSS 0.43% · P37

Possible ATT&CK Techniques 1 AI

T1553 · Subvert Trust Controls

Affected Version Matrix 1

VendorProduct Version RangeStatus
zen-browser desktop < 1.19.13b affected
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I. Basic Information for CVE-2026-45150

Vulnerability Information
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Vulnerability Title
Zen Browser - Missing Fullscreen Security Notification Allows Origin Spoofing
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
关键信息的UI错误表达
Source: CVE Program / CVE List V5
Vulnerability Title
zen-browser desktop 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
zen-browser desktop是zen-browser的台式机。 zen-browser desktop 1.19.13b之前版本存在处理逻辑错误漏洞，该漏洞源于全屏模式下未提供持续、清晰可见的安全通知，导致攻击者控制的页面可隐藏真实浏览器界面和源信息，模仿可信网站界面，并结合长域名URL截断伪造可信源，用于网络钓鱼和凭据窃取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zen-browser desktop < 1.19.13b -

II. Public POCs for CVE-2026-45150

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III. Intelligence Information for CVE-2026-45150

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Vendor Advisories for CVE-2026-45150 (1)

IV. Related Vulnerabilities

Same product: desktop
Same vendor: zen-browser
Same weakness: CWE-451

V. Comments for CVE-2026-45150

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