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CVE-2026-68587 – Missing Authorization / Information Disclosure – SiYuan Note before v3.7.3

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Summary

CVE-2026-68587 is a missing authorization (CWE-862) information-disclosure vulnerability in SiYuan Note, the self-hosted personal knowledge management application. Three "heading transaction" API endpoints return rendered document content without enforcing publish-access checks, allowing a remote, unauthenticated attacker to retrieve content from documents an administrator has marked as publish-disabled. The vendor rates the issue Critical (CVSS v4.0 9.2).

Technical details

  • Root cause: The getHeadingDeleteTransaction, getHeadingLevelTransaction, and getHeadingInsertTransaction handlers apply only a basic authentication check (CheckAuth) and omit the publish-access filter used to protect other content paths.
  • Trigger conditions: An attacker supplies a heading block ID to the affected endpoints (/api/block/getHeadingDeleteTransaction, /api/block/getHeadingLevelTransaction, /api/block/getHeadingInsertTransaction).
  • Attack vector: Network. No authentication or user interaction is required; anonymous readers and limited publish-token holders can reach the endpoints.
  • Impact: The endpoints return rendered block DOM containing the full content of restricted documents, disclosing information that should not be accessible. Integrity and availability are not affected.

Affected software

  • SiYuan Note (siyuan-note/siyuan) all versions before 3.7.3.

Severity

  • CVSS v3.1 base score: 8.6 (High) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
  • The vendor also published a CVSS v4.0 score of 9.2 (Critical) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N.

Mitigation and recommended actions

  • Immediate: Upgrade to SiYuan Note v3.7.3 or later, which adds the missing publish-access checks to the affected endpoints.
  • If no patch: Restrict network access to the SiYuan kernel and Publish service, and avoid running the Publish server in anonymous mode until the upgrade is applied.

References

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