SQL Injection in Siyuan-Note Siyuan
CVE-2026-100644
SiYuan before v3.8.4 contains a SQL injection vulnerability in the graph query endpoint where the dailyNoteSavePath parameter is concatenated into SQL without escaping. Unauthenticated attackers on published sites with auth disabled can inject SQL via UNION SELECT to extract arbitrary database rows from all notebooks.
Vulnerability class: SQL Injection
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (37.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 37.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-xr4h-j7cg-q8pc) (vendor-advisory)
- VulnCheck Advisory: SiYuan before v3.8.4 SQL Injection via dailyNoteSavePath (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100644?
- CVE-2026-100644 is a high-severity vulnerability in Siyuan-Note Siyuan, classified under SQL Injection. CVSS score: 7.5/10. Published 2026-09-26.
- How severe is CVE-2026-100644?
- High severity. CVSS v3 base score is 7.5 out of 10.