CVE-2026-44658

low

Published 2026-05-11 · Modified 2026-05-13

CVSS v3

2.4

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N

CVSS v2

—

VIR risk

2.4

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.

Predictions

Exploit likelihood

36%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No vendor mitigations ingested yet for this CVE. The mitigation-content worker queues fetches as references arrive — check back in a few minutes, or see the references list below.

References

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

CWEs

CWE-20

Verify integrity in audit chain (admin only). AS-IS.