Skip to main content
VulnerabilityPublished

CVE-2026-44658: zen-browser desktop · Improper Input Validation

Affects zen-browser desktopSource CVE Database V5

0
Compare

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

CVSS 3.1 base score
2.4Low
How severe the flaw is on the 0–10 CVSS scale.
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
zen-browserdesktopAffected
  • <1.19.12b
Fixed in
  • 1.19.12b
GitHubzen-browser/desktoppkg:github/zen-browser/desktopOther threatsAffected
  • =1.19.12
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.

References

Community reviews

Loading reviews…