CVE-2026-44658— Zen Browser: RSS Live-Folder Item URLs Are Not Scheme-Restricted Before Trusted Tab Creation
Possible ATT&CK Techniques 1AI
T1189 · Drive-by CompromiseAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| zen-browser | desktop | < 1.19.12b | affected |
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I. Basic Information for CVE-2026-44658
Vulnerability Information
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Vulnerability Title
Zen Browser: RSS Live-Folder Item URLs Are Not Scheme-Restricted Before Trusted Tab Creation
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Zen 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zen是Zen开源的一款基于Firefox的高效生产力浏览器。 Zen 1.19.12b之前版本存在输入验证错误漏洞，该漏洞源于RSS订阅源中的项目链接未受http或https限制，可能导致创建固定延迟标签时存在安全风险。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| zen-browser | desktop | < 1.19.12b | - |
II. Public POCs for CVE-2026-44658
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · zen-browser · 2026-05-11 · 3 CVEs total
| CVE-2026-41431 | 8.0 HIGH | Zen Browser MAR updater ships with signature verification removed — unsigned updates accep |
| CVE-2026-44659 | 4.7 MEDIUM | Zen Browser Mac - Address Bar Spoofing via Long Subdomain |
IV. Related Vulnerabilities
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V. Comments for CVE-2026-44658
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