VulnerabilityDeferred

CVE-2026-44658

This vulnerability is fixed in 1.19.12b.

LOW 2.4EPSS 0.16%

Does this matter?

Lower severity and a low EPSS score (0.16%). Track it; it rarely justifies an emergency change on its own.

Description

Zen is a firefox-based browser. Prior to 1.19.12b, RSS feed URLs entered by the user are validated to http: or https: in promptForFeedUrl, but item links inside the feed are not subject to the same restriction. The provider maps each RSS/Atom item link into item.url, filters only for presence and date, and returns the item list. The live-folder manager later creates pinned lazy tabs from these values with gBrowser.addTrustedTab(item.url, ...). This vulnerability is fixed in 1.19.12b.

CVSS 3.1: 2.4 LOWCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
EPSS: 0.16% probability · 5th percentile
CISA KEV: Not listed
Weakness: CWE-20
Source: security-advisories@github.com

References

https://github.com/zen-browser/desktop/security/advisories/GHSA-cc9c-mmmf-c5j6

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.