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CVE-2026-44659— Zen Browser Mac - Address Bar Spoofing via Long Subdomain

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是Zen开源的一款基于Firefox的高效生产力浏览器。 Zen 1.19.12b之前版本存在安全漏洞，该漏洞源于地址栏错误地截断长主机名并仅显示攻击者控制的子域名前缀，可能导致用户被误导关于网站的实际来源。

CVSS 4.7 · Medium EPSS 0.28% · P18

Affected Version Matrix 1

VendorProduct Version RangeStatus
zen-browser desktop < 1.19.12b affected
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I. Basic Information for CVE-2026-44659

Vulnerability Information
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Vulnerability Title
Zen Browser Mac - Address Bar Spoofing via Long Subdomain
Source: CVE Program / CVE List V5
Vulnerability Description
Zen is a firefox-based browser. Prior to 1.19.12b, the ZEN Browser incorrectly truncates long hostnames in the address bar and shows only the attacker-controlled prefix of the subdomain, hiding the actual registrable domain (eTLD+1). As a result, an attacker can craft extremely long malicious subdomains that visually imitate trusted brands, and the browser will display only the spoofed prefix, misleading users about the actual origin of the site. This directly compromises the URL bar as a security indicator and creates a phishing/supply-chain attack vector. This vulnerability is fixed in 1.19.12b.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A: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 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zen是Zen开源的一款基于Firefox的高效生产力浏览器。 Zen 1.19.12b之前版本存在安全漏洞，该漏洞源于地址栏错误地截断长主机名并仅显示攻击者控制的子域名前缀，可能导致用户被误导关于网站的实际来源。
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 < 1.19.12b -

II. Public POCs for CVE-2026-44659

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III. Intelligence Information for CVE-2026-44659

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Vendor Advisories for CVE-2026-44659 (1)

Same Patch Batch · zen-browser · 2026-05-11 · 3 CVEs total

CVE-2026-41431 8.0 HIGH Zen Browser MAR updater ships with signature verification removed — unsigned updates accep
CVE-2026-44658 2.4 LOW Zen Browser: RSS Live-Folder Item URLs Are Not Scheme-Restricted Before Trusted Tab Creati

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-44659

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