CVE-2026-101091: SiYuan before v3.8.4 SQL Injection via Block Query Embed

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-28 · updated 2026-09-29
Weakness: CWE-89

Description

SiYuan versions before v3.8.4 fail to properly validate SQL statements in block query embed blocks executed against siyuan.db. Attackers can craft malicious .sy documents with non-read-only SQL statements that execute automatically during background indexing, rendering, or export operations without authentication.

Affected products

siyuan-note siyuan: before 3.8.4 — fixed in 3.8.4

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.8.4. Check the vendor advisory for mitigations.

References

https://github.com/siyuan-note/siyuan/commit/e8ace0c89182c7ee1a1298ff2a849bb6a83dfdec
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-67p9-hm94-xwf3
https://www.vulncheck.com/advisories/siyuan-before-3.8.4-sql-injection-via-block-query-embed
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-67p9-hm94-xwf3

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