CVE-2026-44659 Details
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.
A vulnerability in the Zen Browser, a Firefox-based browser, allows for address bar spoofing by truncating long hostnames. In versions prior to 1.19.12b, the browser only displayed the attacker-controlled prefix of subdomains, hiding the actual registrable domain. This flaw enables attackers to create long malicious subdomains that mimic trusted brands, misleading users about the true origin of a site. The issue undermines the URL bar's role as a security indicator, creating a phishing and supply-chain attack vector.
Users can update to Zen Browser version 1.19.12b or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed May 11, 2026CISA-ADP
Assessed May 12, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/zen-browser/desktop/security/advisories/GHSA-7p2r-fp29-9w69 | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-451 | User Interface (UI) Misrepresentation of Critical Information | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Zen | All versions |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 11, 2026 | New CVE Received | [email protected] |