HOMEVULNERABILITIESCVE-2026-44658
LOW

CVE-2026-44658

CWE-20Published: May 11, 2026· Updated: May 13, 2026

2.4
CVSS v3.1
EPSS:0.04%probability of exploitation in 30 daysPercentile:11.7th

Official 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.

NVD Source

Technical Analysis

CVE-2026-44658 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.High
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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All References (1)

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

Quick Facts

CVE IDCVE-2026-44658
CVSS Score2.4 / 10
SeverityLOW
WeaknessCWE-20
CISA KEVNo
EPSS (30d)0.04%
PublishedMay 11, 2026

Related CVEs (CWE-20)

CVE-2026-12537
10.0
CVE-2026-47928
10.0
CVE-2026-33587
10.0
CVE-2026-34910
KEV10.0
CVE-2026-48055
10.0
CVE-2026-0848
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-44658 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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