---
title: "CVE-2026-100644: SiYuan - SQL Injection"
description: "SiYuan < 3.8.4 contains a sql injection caused by unescaped concatenation of the dailyNoteSavePath parameter in the graph query endpoint, letting unauthenticated attackers on published sites with auth disabled extract arbitrary database rows via UNION SELECT."
url: https://panop.io/threat-heartbeat/CVE-2026-100644/
---

# CVE-2026-100644 SiYuan - SQL Injection

SiYuan < 3.8.4 contains a sql injection caused by unescaped concatenation of the dailyNoteSavePath parameter in the graph query endpoint, letting unauthenticated attackers on published sites with auth disabled extract arbitrary database rows via UNION SELECT.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.34% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-100644)

## Details

Type

SQL Injection

Impact

Information Disclosure

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Published

26 September 2026

Updated

15 October 2026

Weakness

[CWE-89](https://cwe.mitre.org/data/definitions/89.html)

## Vendor fix

Update to version 3.8.4 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-100644](https://nvd.nist.gov/vuln/detail/CVE-2026-100644)
- [https://github.com/siyuan-note/siyuan/security/advisories/GHSA-xr4h-j7cg-q8pc](https://github.com/siyuan-note/siyuan/security/advisories/GHSA-xr4h-j7cg-q8pc)
- [https://www.vulncheck.com/advisories/siyuan-before-3.8.4-sql-injection-via-dailynotesavepath](https://www.vulncheck.com/advisories/siyuan-before-3.8.4-sql-injection-via-dailynotesavepath)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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