# CVE-2026-40318

> Vulnerability · severity: **HIGH** (CVSS 8.5).

## 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.

## Key facts

- **CVE ID:** CVE-2026-40318
- **Published:** 2026-04-16
- **CVSS severity:** HIGH
- **CVSS base score:** 8.5
- **CWE codes:** CWE-24

## Affected products

- `b3log:siyuan`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40318

## Citation

> AI Analytics. CVE-2026-40318. Retrieved 2026-07-15 from https://api.ai-analytics.org/cve/CVE-2026-40318. Derived from NIST NVD. Licensed CC0.

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