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CVE-2026-72795 – Information Disclosure (Unauthorized Access to Private/Password-Protected Documents

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Summary

CVE-2026-72795 is an information disclosure vulnerability in SiYuan Note (github.com/siyuan-note/siyuan/kernel) affecting all versions before v3.7.4. The kernel’s getBlockDOMWithEmbed and getBlockDOMsWithEmbed API endpoints fail to filter embedded block content by publish access, allowing anonymous or low-privilege readers to view content from unpublished, hidden, password-protected, or otherwise restricted documents. The issue is rated CRITICAL, with a published CVSS v4.0 base score of 9.2.

Technical details

  • Root cause: the internal function resolveEmbedContentInBox retrieves and inlines embedded block content without applying publish-access filtering, even though it applies such checks to the top-level requested block.
  • The sibling endpoint getEmbedBlock correctly applies FilterEmbedBlocksByPublishAccess, but the DOM-rendering endpoints getBlockDOMWithEmbed and getBlockDOMsWithEmbed do not.
  • Trigger condition: a reader requests any legitimately published document that contains an embed/transclusion query; embedded blocks matched by that query are returned regardless of their own access restrictions.
  • Attack vector: network, no authentication or special privileges required, no user interaction beyond normal viewing of a published document.
  • Impact: disclosure of confidential content from restricted, password-protected, or unpublished documents; workspace-spanning embed queries in aggregation-style published pages can expose substantial private content passively.

Affected software

  • SiYuan (github.com/siyuan-note/siyuan/kernel) — all versions ≤ v3.7.2 / prior to v3.7.4

Severity

  • CVSS v4.0: 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
  • CVSS v3.1: 8.6 (High) — 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 SiYuan to v3.7.4 or later, where publish-access filtering has been applied to the affected endpoints.
  • If patching is not immediately possible: disable or restrict public/publish-mode access to SiYuan workspaces, and avoid publishing documents that contain embed/transclusion queries referencing restricted or password-protected blocks until patched.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Page title: Access Authorization - SiYuan, 思源笔记
  • Raw response body: exitSiYuan, b3log.org/siyuan

References

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