What is CVE-2026-44659?

CVE-2026-44659 is a medium-severity vulnerability in Zen-browser Desktop, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 4.7/10. Published 2026-05-11.

How severe is CVE-2026-44659?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Vulnerability in Zen-browser Desktop

CVE-2026-44659

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…

EPSS: 0.000 (8.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N.

Affected products

Zen-browser Desktop — versions < 1.19.12b

Weakness classification (CWE)

CWE-451 — User Interface (UI) Misrepresentation of Critical Information

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-44659?: CVE-2026-44659 is a medium-severity vulnerability in Zen-browser Desktop, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 4.7/10. Published 2026-05-11.
How severe is CVE-2026-44659?: Medium severity. CVSS v3 base score is 4.7 out of 10.