Yelp: yelp-xsl: overly permissive content security policy in yelp allows host file disclosure from flatpak applications_CVE-2026-13601

{
    "lastseen": "",
    "description": "A flaw was found in Yelp due to an overly permissive Content Security Policy (CSP) implementation provided by yelp-xsl. A malicious Flatpak application can open crafted help content through the OpenURI portal. By embedding an untrusted CSS stylesheet within a structured SVG document, attacker-controlled content can bypass Flatpak's intended sandbox isolation, allowing Yelp to evaluate local XML inclusions and disclose arbitrary user-readable host files through remote CSS resource requests. This may result in the unauthorized disclosure of sensitive information.",
    "published": "2026-06-29T09:20:40.865Z",
    "modified": "2026-06-29T10:03:06.274Z",
    "type": "cve",
    "title": "Yelp: yelp-xsl: overly permissive content security policy in yelp allows host file disclosure from flatpak applications",
    "source": "redhat",
    "references": "https://access.redhat.com/security/cve/CVE-2026-13601\nhttps://blogs.gnome.org/mcatanzaro/2026/05/11/flatpak-sandbox-escape-via-yelp/\nhttps://bugzilla.redhat.com/show_bug.cgi?id=2494110\nhttps://gitlab.gnome.org/GNOME/yelp/-/commit/c8c8244c8a812860782d635890c9b6c43ecc2639\nhttps://gitlab.gnome.org/GNOME/yelp/-/work_items/238",
    "id": "CVE-2026-13601",
    "bulletinFamily": "",
    "cwe": [
        "CWE-693"
    ],
    "cvelist": null,
    "sourceData": "",
    "sourceHref": "",
    "cvss": {
        "score": 7.1,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N",
        "version": "3.1"
    },
    "cvss2": [],
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        "baseScore": 0,
        "baseSeverity": "",
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        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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            "baseScore": 0,
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Red Hat Enterprise Linux 10",
    "version": "",
    "vendor": "Red Hat",
    "ai_description": "",
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    "ai_score": 0
}