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CVE-2026-69084 – Unauthenticated SQL Injection (Arbitrary SQL Read/Write) – SiYuan Note v3.7.2 and e

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Summary

CVE-2026-69084 is a critical SQL injection vulnerability in SiYuan Note (siyuan-note/siyuan) affecting all versions up to and including v3.7.2. The /api/search/searchEmbedBlock endpoint passes a client-supplied SQL statement directly to the main read-write database, allowing an unauthenticated or reader-role attacker to read and modify content across all cleartext notebooks. It is rated Critical (CVSS v3.1 10.0 / CVSS v4.0 9.9).

Technical details

  • Root cause: The POST /api/search/searchEmbedBlock endpoint accepts a stmt parameter and passes it verbatim to the database via SearchEmbedBlock → SearchEmbedBlockInBox → sql.SelectBlocksRawStmtNoParse(), with no CheckSingleStatement, CheckReadonlyStatement, or CheckAdminRole guards (CWE-89).
  • Trigger conditions: Publish mode enabled with authentication disabled, or a request authenticated with a publish RoleReader token. The statement executes against the global read-write siyuan.db handle, which supports stacked, ;-separated statements.
  • Attack vector: Network; remote and unauthenticated when publish authentication is disabled. No user interaction and no elevated privileges required.
  • Impact: Arbitrary SQL read/write across all opened cleartext notebooks, enabling content disclosure and modification without admin credentials or write-API permissions. Encrypted notebooks remain protected.

Affected software

  • SiYuan Note (siyuan-note/siyuan kernel) — all versions up to and including v3.7.2.

Severity

  • CVSS v3.1 base score: 10.0 (Critical) — vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N.
  • CVSS v4.0 base score: 9.9 (Critical) — vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N.

Mitigation and recommended actions

  • Immediate: Upgrade to SiYuan Note v3.7.3 or later, which adds statement validation to the affected endpoint.
  • If no patch can be applied: Enable authentication on the publish server (do not run publish mode with authentication disabled), and restrict network access to the SiYuan instance so the /api/search/searchEmbedBlock endpoint is not reachable by untrusted clients.

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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