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CVE-2026-100644 – SQL Injection (Unauthenticated Data Exfiltration) – SiYuan Note ≤ v3.8.3

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Summary

CVE-2026-100644 is a SQL injection vulnerability (CWE-89) in SiYuan Note, a self-hosted personal knowledge management application, affecting all versions up to and including v3.8.3. The flaw resides in the graph query endpoint’s handling of the dailyNoteSavePath notebook configuration value, which is concatenated directly into SQL statements without escaping. On published sites with authentication disabled, an unauthenticated attacker can exploit this to read arbitrary data from the entire workspace database, including content from private notebooks.

Technical details

  • Root cause: The graphDailyNoteFilter() function builds SQL queries by directly concatenating the notebook’s dailyNoteSavePath configuration value into the query string, without sanitizing special characters such as quotes.
  • Trigger conditions: The malicious dailyNoteSavePath value can be set by a workspace administrator (e.g., unknowingly, via importing a crafted notebook archive) or otherwise present in a notebook’s configuration; the query is then reachable through the graph query endpoint.
  • Attack vector: Network-based; the endpoint filter (CheckReadonlyStatement) permits UNION SELECT statements, and published sites with authentication disabled grant anonymous requests an anonymous RoleReader JWT, allowing exploitation with no credentials and no user interaction.
  • Impact: Confidentiality impact only — an attacker can issue a single crafted request to extract arbitrary rows from the SQL database backing the workspace, spanning all notebooks including private ones. No impact on integrity or availability is reported.

Affected software

  • SiYuan Note (siyuan-note/siyuan): all versions through v3.8.3
  • Fixed in: v3.8.4

Severity

  • CVSS v3.1 Base Score: 7.5 (High) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  • CVSS v4.0 Base Score: 8.7 (High) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade SiYuan Note to v3.8.4 or later, which patches the unsanitized SQL concatenation.
  • If immediate patching is not possible:
    • Disable "publish site" / public sharing features, or ensure authentication is enabled on any published site rather than leaving it disabled.
    • Restrict network access to SiYuan instances (e.g., place behind a VPN or IP allowlist) to prevent unauthenticated internet exposure.
    • Audit any imported notebook archives for unexpected or malformed dailyNoteSavePath configuration values.

References

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