CVE-2026-44658: zen-browser desktop · Improper Input Validation
Affects zen-browser desktopSource CVE Database V5
Not known to be exploited · CVSS 2.4 Low : upgrade to 1.19.12b when convenient.
Data as of 30 Oct 2026, 11:52 UTC
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 1.19.12b
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 11 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Upgrade zen-browser desktop to 1.19.12b.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| zen-browserdesktop | Affected
| Fixed in
|
GitHubzen-browser/desktoppkg:github/zen-browser/desktopOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
This vulnerability is fixed in zen-browser version 1.19.12b. Users and administrators should upgrade to version 1.19.12b or later to remediate this issue. Since no official remediation level is provided beyond the fix, applying the update is the recommended action. No additional mitigation steps are indicated.
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.