CVE-2026-40318

Name: CVE-2026-40318
Creator: NVD / NIST
Published: 2026-04-16T23:16:33.59+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.5/10EPSS 0.29%

Last modified Jun 17, 2026

CVE-2026-40318 is a high-severity vulnerability rated 8.5/10 on the CVSS scale. 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 boundary enforcement. EPSS estimates a 0.29% chance of exploitation in the next 30 days.

Description

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 boundary enforcement. An attacker can inject path traversal sequences such as ../ into the id value to escape the intended directory and delete arbitrary .json files on the server, including global configuration files and workspace metadata. This issue has been fixed in version 3.6.4.

Metrics

CVSS 3.1

8.5/10

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

EPSS Probability

0.29%

20.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-24

Affected Software

Vendor	Product	Versions
B3log	Siyuan	< 3.6.4

References

https://github.com/siyuan-note/siyuan/releases/tag/v3.6.4Release Notes
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-vw86-c94w-v3x4Third Party Advisory

Timeline

Published: Apr 16, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-40318?

How severe is CVE-2026-40318?

CVE-2026-40318 has a CVSS score of 8.5/10 (HIGH severity). The EPSS model estimates a 0.29% probability of exploitation in the next 30 days.

How do I fix CVE-2026-40318?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-40318?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST