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CVE-2026-23851— SiYuan Vulnerable to Arbitrary File Read via File Copy Functionality

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开源的一个隐私至上的个人知识管理系统。 SiYuan 3.5.4之前版本存在路径遍历漏洞，该漏洞源于/api/file/globalCopyFiles端点存在逻辑漏洞，缺少适当的路径验证，可能导致经过身份验证的用户将服务器文件系统上任意位置的文件复制到应用程序工作区。

AI Predicted 5.5 Difficulty: Trivial EPSS 0.52% · P43

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery
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I. Basic Information for CVE-2026-23851

Vulnerability Information
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Vulnerability Title
SiYuan Vulnerable to Arbitrary File Read via File Copy Functionality
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan is a personal knowledge management system. Versions prior to 3.5.4 contain a logic vulnerability in the /api/file/globalCopyFiles endpoint. The function allows authenticated users to copy files from any location on the server's filesystem into the application's workspace without proper path validation. The vulnerability exists in the api/file.go source code. The function globalCopyFiles accepts a list of source paths (srcs) from the JSON request body. While the code checks if the source file exists using filelock.IsExist(src), it fails to validate whether the source path resides within the authorized workspace directory. Version 3.5.4 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan开源的一个隐私至上的个人知识管理系统。 SiYuan 3.5.4之前版本存在路径遍历漏洞，该漏洞源于/api/file/globalCopyFiles端点存在逻辑漏洞，缺少适当的路径验证，可能导致经过身份验证的用户将服务器文件系统上任意位置的文件复制到应用程序工作区。
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 < 3.5.4 -

II. Public POCs for CVE-2026-23851

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III. Intelligence Information for CVE-2026-23851

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Same Patch Batch · siyuan-note · 2026-01-19 · 4 CVEs total

CVE-2026-23852 SiYuan vulnerable to Stored XSS / RCE via `setBlockAttrs` icon attribute
CVE-2026-23850 SiYuan vulnerable to arbitrary file read
CVE-2026-23847 SiYuan Vulnerable to Reflected Cross-Site Scripting (XSS) via /api/icon/getDynamicIcon

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-22

V. Comments for CVE-2026-23851

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