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CVE-2026-23850— SiYuan vulnerable to arbitrary file read

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markdown功能允许不受限制的服务器端HTML渲染，可能导致任意文件读取。

AI Predicted 5.3 Difficulty: Easy EPSS 0.62% · P49

Possible ATT&CK Techniques 1 AI

T1555 · Credentials from Password Stores
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I. Basic Information for CVE-2026-23850

Vulnerability Information
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Vulnerability Title
SiYuan vulnerable to arbitrary file read
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan is a personal knowledge management system. In versions prior to 3.5.4, the markdown feature allows unrestricted server side html-rendering which allows arbitrary file read (LFD). Version 3.5.4 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:P
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markdown功能允许不受限制的服务器端HTML渲染，可能导致任意文件读取。
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-2026-23850

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III. Intelligence Information for CVE-2026-23850

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Patches & Fixes for CVE-2026-23850 (2)

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-2026-23851 SiYuan Vulnerable to Arbitrary File Read via File Copy Functionality
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-2026-23850

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