VulnerabilityAnalyzed

CVE-2026-40318

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.

HIGH 8.5EPSS 0.29%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.29%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 3.1: 8.5 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
EPSS: 0.29% probability · 21th percentile
CISA KEV: Not listed
Weakness: CWE-24
Affected: b3log/siyuan
Source: security-advisories@github.com

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

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.