CVE-2026-85580

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    CVE-2026-85580

    Published: 4 Sept 2026Last Modified: 10 Sept 2026

    Summary: SiYuan before v3.8.2 Path Guard Bypass via Case Mismatch

    Details: SiYuan versions before v3.8.2 contain a path guard bypass vulnerability in the MCP file-access handler that uses case-sensitive matching on Linux filesystems. Attackers can read the protected publishAccess.json file by requesting case-variant paths like PublishAccess.json to disclose sensitive publish-access configuration and metadata.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85580.json, https://github.com/siyuan-note/siyuan/security/advisories/GHSA-mmgw-3mx9-cfwp, https://nvd.nist.gov/vuln/detail/CVE-2026-85580, https://www.vulncheck.com/advisories/siyuan-before-3.8.2-path-guard-bypass-via-case-mismatch

    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-2026-85580 | CVE-DB