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    CVE-2026-84803

    SiYuan before v3.8.2 contains a stored cross-site scripting vulnerability in asset serving due to an incomplete extension blocklist that misses script-capable file types. Attackers can upload files with extensions like .xht, .ehtml, .xsl, .xbl, or .rdf that resolve to executable media types and execute JavaScript to steal API tokens and compromise workspaces.

    Published:Sep 2, 2026
    Last Modified:Sep 2, 2026
    EPS:Sep 2, 2026
    EPSS Score:0.00234
    CVSS Score:9

    Affected Products

    Vendor
    B3log
    Product
    Siyuan
    Vendor
    Siyuan
    Product
    Siyuan

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-87811 (CVSS 8.4) — SiYuan before v3.8.2 inserts persisted notebook template paths into HTML input value attributes without proper…
    CVE-2026-87810 (CVSS 6.9) — Siyuan before v3.8.2 contains an information disclosure vulnerability in the POST /api/search/fullTextSearchBl…
    CVE-2026-87809 (CVSS 7.1) — Siyuan before v3.8.2 fails to apply publish-access filtering to embedded blocks before rendering in the /api/e…
    CVE-2026-87808 (CVSS 8.7) — SiYuan versions <= 3.8.1 contain an incomplete fix for CVE-2026-32767 (GHSA-j7wh-x834-p3r7). The prior fix (co…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High