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CVE-2026-44658— Zen Browser: RSS Live-Folder Item URLs Are Not Scheme-Restricted Before Trusted Tab Creation

Quick assessment

Affected
zen-browser desktop
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 2.4 · Low EPSS 0.27% · P17

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2026-44658

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Vendor Advisories for CVE-2026-44658 (1)

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

Same product: desktop
Same vendor: zen-browser
Same weakness: CWE-20

V. Comments for CVE-2026-44658

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