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CVE-2026-73608 – Missing Authorization / Sensitive Data Exposure – SiYuan (development branch, pre-3

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Summary

CVE-2026-73608 is a missing-authorization vulnerability in SiYuan Note’s /api/av/getAttributeViewSearchTarget endpoint, present only in the development branch prior to version 3.7.4. The flaw lets an anonymous, unauthenticated reader query the endpoint and retrieve attribute-view (database) row content that publish-mode access filters are meant to withhold. The issue carries a CVSS v3.1 base score of 8.6 (High).

Technical details

  • Root cause: the getAttributeViewSearchTarget route was registered with only the general CheckAuth middleware and lacked the CheckReadonly guard and access-filtering logic applied to other attribute-view endpoints.
  • A comparable endpoint (getAttributeViewFieldViews) had equivalent authorization checks added one day earlier; this newly introduced route did not receive the same protection.
  • Trigger conditions: the vulnerable route exists only in the SiYuan development branch (introduced July 27, 2026) and is reachable when the Publish server is running, even in anonymous-access mode.
  • Attack vector: network-based, unauthenticated, no user interaction required — an attacker simply sends a request to the exposed endpoint.
  • Impact: disclosure of database row content, including rows that should be hidden from anonymous/publish-mode readers by permission or publish filters. No impact on integrity or availability is noted.

Affected software

  • SiYuan Note development branch versions prior to 3.7.4 (introduced by commit 9b8e8956f on July 27, 2026)
  • Stable releases, including v3.7.3 and earlier, are not affected

Severity

  • CVSS v3.1 Base Score: 8.6 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: upgrade to SiYuan v3.7.4 or later, which adds the missing authorization checks to the getAttributeViewSearchTarget endpoint.
  • If patching is not immediately possible: avoid running development-branch builds of SiYuan in publish mode on internet-exposed hosts; restrict network access to the SiYuan kernel/publish service to trusted networks until upgraded.

References

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