CVE-2026-87809

    Dashboard / Vulnerabilities / CVE-2026-87809

    CVE-2026-87809

    Published: 9 Sept 2026Last Modified: 11 Sept 2026

    Summary: Siyuan before v3.8.2 Information Disclosure via Export Preview

    Details: Siyuan before v3.8.2 fails to apply publish-access filtering to embedded blocks before rendering in the /api/export/preview and /api/lute/copyStdMarkdown endpoints. Attackers with reader access can retrieve the full rendered content of private, hidden, or publish-disabled blocks by accessing public documents containing embed queries that select those blocks.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87809.json, https://github.com/siyuan-note/siyuan/security/advisories/GHSA-8wx4-fvqw-f5f8, https://nvd.nist.gov/vuln/detail/CVE-2026-87809, https://www.vulncheck.com/advisories/siyuan-before-3.8.2-information-disclosure-via-export-preview

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -44a6c212a994c7ba8129fc38b001a9ab58957c6f

    Affected versions

    v3.8.2-beta.4
    v3.8.2-beta.3
    v3.8.2-beta.2
    v3.8.2-beta.1
    v3.8.2-alpha.6
    v3.8.2-alpha.5
    v3.8.2-alpha.4
    v3.8.2-alpha.3
    v3.8.2-alpha.1
    v3.8.1
    v3.8.1-beta.6
    v3.8.1-beta.5
    v3.8.1-beta.4
    v3.8.1-beta.1
    v3.8.0
    v3.8.0-beta.2
    v3.8.0-alpha.4
    v3.8.0-alpha.3
    v3.8.0-alpha.2

    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
    CVE-2026-87809 | CVE-DB