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

{
    "lastseen": "",
    "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.",
    "published": "2026-05-11T17:00:31.639Z",
    "modified": "2026-05-11T17:00:31.639Z",
    "type": "cve",
    "title": "Zen Browser: RSS Live-Folder Item URLs Are Not Scheme-Restricted Before Trusted Tab Creation",
    "source": "GitHub_M",
    "references": "https://github.com/zen-browser/desktop/security/advisories/GHSA-cc9c-mmmf-c5j6",
    "id": "CVE-2026-44658",
    "bulletinFamily": "",
    "cwe": [
        "CWE-20"
    ],
    "cvelist": null,
    "sourceData": "zen-browser desktop < 1.19.12b",
    "sourceHref": "",
    "cvss": {
        "score": 2.4,
        "severity": "LOW",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
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        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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            "baseScore": 0,
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "desktop",
    "version": "< 1.19.12b",
    "vendor": "zen-browser",
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    "ai_score": 0
}