PT-2026-33210 · Siyuan · Siyuan

Published 2026-04-10 · Updated 2026-04-17 · CVE-2026-40318

Positive Technologies (AI Summary)

CVSS v3.1

8.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions SiYuan versions prior to 3.6.4

Description The '/api/av/removeUnusedAttributeView' endpoint constructs a filesystem path using the user-controlled id parameter without validation or path boundary enforcement. This allows an attacker to inject path traversal sequences, such as '../', to escape the intended directory and delete arbitrary .json files on the server, including global configuration files and workspace metadata. Path traversal is a technique used to access files and directories that are stored outside the web root folder.

Recommendations Update to version 3.6.4. As a temporary workaround, avoid using the id parameter in the '/api/av/removeUnusedAttributeView' endpoint until the update is applied.

Fix

Weakness Enumeration

CWE-24

Related Identifiers

CVE-2026-40318

GHSA-VW86-C94W-V3X4

Affected Products

Siyuan

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-40318 · Security Note
• https://osv.dev/vulnerability/GHSA-vw86-c94w-v3x4 · Vendor Advisory
• https://github.com/siyuan-note/siyuan/releases/tag/v3.6.4 · Note
• https://github.com/siyuan-note/siyuan · Note
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-vw86-c94w-v3x4 · Note
• https://twitter.com/CVEnew/status/2045102633522712828 · Twitter Post