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CVE-2026-33476— SiYuan has an Unauthenticated Arbitrary File Read via Path Traversal

Quick assessment

Affected
siyuan-note siyuan
Exploitation
Public or AI PoC available; prioritize validation
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 3.6.2之前版本存在安全漏洞，该漏洞源于/appearance/*filepath端点路径清理不当，可能导致目录遍历和任意文件读取。

CVSS 7.5 · High EPSS 3.26% · P87

Public Exploits 1

Nuclei · 1 CVE-2026-33476.yaml [template]

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery
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I. Basic Information for CVE-2026-33476

Vulnerability Information
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Vulnerability Title
SiYuan has an Unauthenticated Arbitrary File Read via Path Traversal
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan is a personal knowledge management system. Prior to version 3.6.2, the Siyuan kernel exposes an unauthenticated file-serving endpoint under `/appearance/*filepath.` Due to improper path sanitization, attackers can perform directory traversal and read arbitrary files accessible to the server process. Authentication checks explicitly exclude this endpoint, allowing exploitation without valid credentials. Version 3.6.2 fixes this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A: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 安全漏洞
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 3.6.2之前版本存在安全漏洞，该漏洞源于/appearance/*filepath端点路径清理不当，可能导致目录遍历和任意文件读取。
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 < 3.6.2 -

II. Public POCs for CVE-2026-33476

# POC Description Source Link Shenlong Link
1 SiYuan is a personal knowledge management system. Prior to version 3.6.2, the Siyuan kernel exposes an unauthenticated file-serving endpoint under `/appearance/*filepath.` Due to improper path sanitization, attackers can perform directory traversal and read arbitrary files accessible to the server process. Authentication checks explicitly exclude this endpoint, allowing exploitation without valid credentials. Version 3.6.2 fixes this issue. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-33476.yaml POC Details
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Qwen3.6-35B-A3B · 7276 chars
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III. Intelligence Information for CVE-2026-33476

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Patches & Fixes for CVE-2026-33476 (1)

Vendor Advisories for CVE-2026-33476 (1)

Same Patch Batch · siyuan-note · 2026-03-20 · 8 CVEs total

CVE-2026-32938 9.9 CRITICAL SiYuan has an Arbitrary File Read in its Desktop Publish Service
CVE-2026-32767 9.8 CRITICAL SiYuan: Authorization Bypass Allows Arbitrary SQL Execution via Search API
CVE-2026-32940 9.3 CRITICAL SiYuan has a SanitizeSVG bypass via data:text/xml in getDynamicIcon (incomplete fix for CV
CVE-2026-33203 7.5 HIGH SiYuan has an Unauthenticated WebSocket DoS via Auth Keepalive Bypass
CVE-2026-33194 6.8 MEDIUM SiYuan has an Incomplete Fix for IsSensitivePath Denylist Allows File Read from /opt, /usr
CVE-2026-33067 SiYuan has Stored XSS to RCE via Unsanitized Bazaar Package Metadata
CVE-2026-33066 SiYuan has Stored XSS to RCE via Unsanitized Bazaar README Rendering

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-33476

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