CVE-2026-100644 SiYuan before v3.8.4 SQL Injection via dailyNoteSavePath
Unauthenticated attackers can extract arbitrary database rows via SQL injection in SiYuan when authentication is disabled on published sites.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100644?
CVE-2026-100644 is a high-severity SQL injection vulnerability in siyuan-note siyuan, published on 26 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-89
Which versions are affected by CVE-2026-100644?
How do I fix CVE-2026-100644?
No fix has been published for CVE-2026-100644 yet. Limit exposure of the affected software until one is available.
Use parameterised queries everywhere and never build SQL by joining strings. Upgrade affected software first; a web application firewall only buys time. More about SQL injection.
Is CVE-2026-100644 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100644 exists.
Sources
Also known as GHSA-hvf4-6hmp-9mpm, GHSA-xr4h-j7cg-q8pc.