SiYuan: Unauthenticated Admin API Access via Blanket chrome-extension:// Origin Allowlist_CVE-2026-54069

{
    "lastseen": "",
    "description": "SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, SiYuan Note's kernel HTTP server unconditionally trusts all chrome-extension:// origins, granting RoleAdministrator access to every installed browser extension without any authentication. Combined with the default empty AccessAuthCode on desktop installs, any Chrome/Chromium extension -- including a compromised legitimate extension via supply chain attack -- can make fully authenticated admin API calls to the SiYuan kernel at 127.0.0.1:6806, enabling data exfiltration, stored XSS injection, and configuration tampering. This vulnerability is fixed in 3.7.0.",
    "published": "2026-06-24T21:17:02.466Z",
    "modified": "2026-06-24T21:17:02.466Z",
    "type": "cve",
    "title": "SiYuan: Unauthenticated Admin API Access via Blanket chrome-extension:// Origin Allowlist",
    "source": "GitHub_M",
    "references": "https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hvr9-72v2-fff3",
    "id": "CVE-2026-54069",
    "bulletinFamily": "",
    "cwe": [
        "CWE-346"
    ],
    "cvelist": null,
    "sourceData": "siyuan-note siyuan < 3.7.0",
    "sourceHref": "",
    "cvss": {
        "score": 9.2,
        "severity": "CRITICAL",
        "vector": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "privilegesRequired": "",
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            "confidentialityImpact": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "siyuan",
    "version": "< 3.7.0",
    "vendor": "siyuan-note",
    "ai_description": "Unauthenticated admin API access via blanket chrome-extension:// origin allowlist, enabling data exfiltration, stored XSS injection, and configuration tampering.",
    "ai_severity": "Critical",
    "ai_vendor": "SiYuan",
    "ai_product": "SiYuan Note",
    "ai_version": "< 3.7.0",
    "ai_score": 9.2
}