Zen · Zen · CVE-2026-44658
**Name of the Vulnerable Software and Affected Versions**
Zen versions prior to 1.19.12b
**Description**
In the `promptForFeedUrl()` function, RSS feed URLs entered by the user are validated to ensure they use http: or https: protocols. However, item links within the feed are not subject to this restriction. The provider maps each RSS/Atom item link into `item.url`, filtering only for presence and date. Subsequently, the live-folder manager creates pinned lazy tabs using these values via `gBrowser.addTrustedTab(item.url, ...)`, which can lead to the execution of unauthorized protocols.
**Recommendations**
Update to version 1.19.12b.