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CVE-2026-40318— SiYuan: Publish Reader Path Traversal Delete via `removeUnusedAttributeView`

Quick assessment

Affected
siyuan-note siyuan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SiYuan是SiYuan开源的一个个人知识管理系统。 SiYuan 3.6.3及之前版本存在安全漏洞，该漏洞源于/api/av/removeUnusedAttributeView端点使用用户控制的id参数构造文件系统路径而未经验证或路径边界强制，攻击者可注入路径遍历序列以删除服务器上的任意.json文件。

CVSS 8.5 · High EPSS 0.44% · P37

Possible ATT&CK Techniques 1 AI

T1564.008 · Email Hiding Rules
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I. Basic Information for CVE-2026-40318

Vulnerability Information
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Vulnerability Title
SiYuan: Publish Reader Path Traversal Delete via `removeUnusedAttributeView`
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
路径遍历：’../filedir’
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan开源的一个个人知识管理系统。 SiYuan 3.6.3及之前版本存在安全漏洞，该漏洞源于/api/av/removeUnusedAttributeView端点使用用户控制的id参数构造文件系统路径而未经验证或路径边界强制，攻击者可注入路径遍历序列以删除服务器上的任意.json文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan < 3.6.4 -

II. Public POCs for CVE-2026-40318

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III. Intelligence Information for CVE-2026-40318

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Vendor Advisories for CVE-2026-40318 (1)

Same Patch Batch · siyuan-note · 2026-04-16 · 4 CVEs total

CVE-2026-40322 9.1 CRITICAL SiYuan: Mermaid `javascript:` Link Injection Leads to Stored XSS and Electron RCE
CVE-2026-40259 8.1 HIGH SiYuan: Publish Reader Can Arbitrarily Delete Attribute View Files via removeUnusedAttribu
CVE-2026-40922 SiYuan: Incomplete sanitization of bazaar README allows stored XSS via iframe srcdoc (inco

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-24

V. Comments for CVE-2026-40318

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