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CVE-2026-44659

Zen Browser Mac - Address Bar Spoofing via Long Subdomain

Published: May 11, 2026Updated: May 13, 2026 Sources: CVE List NVDCWE-451
NVD MITRE
4.7CVSSMEDIUM
EPSS Score
0.2%
Top 94.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:CC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-451

Affected Products

desktopzen-browser
Mixed
Consumer Software / browser
zen-browseross-projectConsumer Softwareaka desktop

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://github.com/zen-browser/desktop/security/advisories/GHSA-7p2r-fp29-9w69
github.com

Timeline

Published
May 11, 2026
Last Updated
May 13, 2026

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