Is CVE-2026-100644 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-100644 being exploited in the wild.

How severe is CVE-2026-100644?

High severity, with a CVSS score of 7.5, published 26 September 2026.

Which products and versions are affected?

SiYuan Note SiYuan before 3.8.4.

Is there a fix for CVE-2026-100644?

A patch was published on 2026-09-08: v3.8.4 released with fix Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-100644 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-100644?

Check whether you run SiYuan Note SiYuan at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-100644: SiYuan SQL injection in graph query endpoint

CVE-2026-100644 · Severity: high · CVSS 7.5 · Published 2026-09-26

SiYuan is a note-taking and knowledge management application that syncs across devices. Versions before 3.8.4 contain a SQL injection vulnerability in the graph query API that allows unauthenticated attackers to extract sensitive data from all notebooks when the application is published with authentication disabled. An attacker can read database contents including private notes and documents from other notebooks without any credentials.

Technologies: SiYuan Note SiYuan. Vendors: SiYuan Note.

Quick answers

Is CVE-2026-100644 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-100644 being exploited in the wild.
How severe is CVE-2026-100644?: High severity, with a CVSS score of 7.5, published 26 September 2026.
Which products and versions are affected?: SiYuan Note SiYuan before 3.8.4.
Is there a fix for CVE-2026-100644?: A patch was published on 2026-09-08: v3.8.4 released with fix Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-100644 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-100644?: Check whether you run SiYuan Note SiYuan at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability exists in the graphDailyNoteFilter() function in kernel/model/graph.go, where the dailyNoteSavePath parameter is concatenated directly into SQL queries without escaping. An attacker can close the SQL string literal with a quote and append arbitrary SQL (e.g., UNION SELECT) to extract rows from the workspace database. The attack requires the application to be published with authentication disabled; the unauthenticated requests are admitted as anonymous RoleReader under publish mode without credentials.

Affected products

siyuan-note SiYuan before 3.8.4

Timeline

2026-09-26: disclosed
2026-09-08: patched: v3.8.4 released with fix

References

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