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CVE-2026-40259— SiYuan: Publish Reader Can Arbitrarily Delete Attribute View Files via removeUnusedAttributeView API

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端点仅受通用身份验证保护，且处理程序将调用者控制的id直接传递给模型函数，导致未经写权限验证即删除属性视图文件，经过身份验证的发布服务读者可永久删除任意属性视图定义。

CVSS 8.1 · High EPSS 0.54% · P44
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I. Basic Information for CVE-2026-40259

Vulnerability Information
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Vulnerability Title
SiYuan: Publish Reader Can Arbitrarily Delete Attribute View Files via removeUnusedAttributeView API
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan is an open-source personal knowledge management system. In versions 3.6.3 and below, the /api/av/removeUnusedAttributeView endpoint is protected only by generic authentication that accepts publish-service RoleReader tokens. The handler passes a caller-controlled id directly to a model function that unconditionally deletes the corresponding attribute view file from the workspace without verifying that the caller has write privileges or that the target attribute view is actually unused. An authenticated publish-service reader can permanently delete arbitrary attribute view definitions by extracting publicly exposed data-av-id values from published content, causing breakage of database views and workspace rendering until manually restored. 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:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
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端点仅受通用身份验证保护，且处理程序将调用者控制的id直接传递给模型函数，导致未经写权限验证即删除属性视图文件，经过身份验证的发布服务读者可永久删除任意属性视图定义。
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 < 0.0.0-20260407035653-2f416e5253f1 -

II. Public POCs for CVE-2026-40259

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III. Intelligence Information for CVE-2026-40259

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Vendor Advisories for CVE-2026-40259 (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-2026-40318 8.5 HIGH SiYuan: Publish Reader Path Traversal Delete via `removeUnusedAttributeView`
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-285

V. Comments for CVE-2026-40259

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