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    CVE-2026-82654

    SiYuan before v3.8.1 fails to properly escape block name, alias, and memo fields in hint, backlink, and breadcrumb rendering functions. Attackers can set a block's name to contain HTML/script tags that execute when another user views documents referencing or displaying that block.

    Published:Aug 30, 2026
    Last Modified:Sep 1, 2026
    EPS:Aug 30, 2026
    EPSS Score:0.00223
    CVSS Score:8.9

    Affected Products

    Vendor
    B3log
    Product
    Siyuan
    Vendor
    Siyuan
    Product
    Siyuan

    Exploits

    No exploit reference

    Related CVEs

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    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