CVE-2026-44659
Zen Browser Mac - Address Bar Spoofing via Long Subdomain
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.
INFO
Published Date :
May 11, 2026, 6:16 p.m.
Last Modified :
Oct. 26, 2026, 6:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE |
Solution
- Update Zen Browser to version 1.19.12b.
- Verify hostname display accuracy.
- Educate users about URL spoofing risks.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-44659.
| URL | Resource |
|---|---|
| https://github.com/zen-browser/desktop/security/advisories/GHSA-7p2r-fp29-9w69 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-44659 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-44659
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-44659 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-44659 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 26, 2026
Action Type Old Value New Value Added Translation Title: desktop de zen-browser, Description: Zen es un navegador basado en Firefox. Anteriormente a 1.19.12b, el navegador ZEN trunca incorrectamente los nombres de host largos en la barra de direcciones y muestra solo el prefijo del subdominio controlado por el atacante, ocultando el dominio registrable real (eTLD+1). Como resultado, un atacante puede crear subdominios maliciosos extremadamente largos que imitan visualmente marcas de confianza, y el navegador mostrará solo el prefijo falsificado, engañando a los usuarios sobre el origen real del sitio. Esto compromete directamente la barra de URL como indicador de seguridad y crea un vector de ataque de phishing/cadena de suministro. Esta vulnerabilidad está corregida en 1.19.12b. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'zen-browser', 'product': 'desktop', 'versions': [{'status': 'affected', 'version': '< 1.19.12b'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-44659', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-05-12T16:13:40.754441Z'} -
New CVE Received by [email protected]
May. 11, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N Added CWE CWE-451 Added Reference https://github.com/zen-browser/desktop/security/advisories/GHSA-7p2r-fp29-9w69