medium4.7
CVE-2026-44659
Zen is a firefox-based browser.
Impact
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.
Affected products
| Product | Affected versions |
|---|---|
| Zen Is A Firefox-Based Browser. | before 1.19.12b |
Versions were read from the advisory text. No structured product data has been published for this record yet.