What is CVE-2026-40318?

CVE-2026-40318 is a high-severity vulnerability in Siyuan-note Siyuan, classified under CWE-24. CVSS score: 8.5/10. Published 2026-04-16.

How severe is CVE-2026-40318?

High severity. CVSS v3 base score is 8.5 out of 10.

Vulnerability in Siyuan-note Siyuan

CVE-2026-40318

SiYuan is an open-source personal knowledge management system. In versions 3.6.3 and prior, the /api/av/removeUnusedAttributeView endpoint constructs a filesystem path using the user-controlled id parameter without validation or path bound…

EPSS: 0.001 (22.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H.

Affected products

Siyuan-note Siyuan — versions < 3.6.4

Weakness classification (CWE)

CWE-24

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-vw86-c94w-v3x4 (x_refsource_CONFIRM)
https://github.com/siyuan-note/siyuan/releases/tag/v3.6.4 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-40318?: CVE-2026-40318 is a high-severity vulnerability in Siyuan-note Siyuan, classified under CWE-24. CVSS score: 8.5/10. Published 2026-04-16.
How severe is CVE-2026-40318?: High severity. CVSS v3 base score is 8.5 out of 10.