CVE-2026-74904

Summary

SiYuan before v3.7.4 is missing authorization checks in 17 block metadata/content endpoints in kernel/api/block.go (including getRefText, checkBlockExist, and getBlockBreadcrumb). These handlers are gated only by basic authentication (model.CheckAuth) and lack publish-access filtering, allowing anonymous publish-mode readers to disclose private block content-derived text, structural metadata, and existence information for arbitrary block IDs across the workspace.

Affected Software

Weaknesses

• CWE-862: Missing Authorization

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

Additional References

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4vpg-gwqq-w44c

References

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-4vpg-gwqq-w44c
• https://www.vulncheck.com/advisories/siyuan-before-missing-authorization-via-block-api

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