What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-20 · updated 2026-06-17
• Weakness: CWE-22

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.

Affected products

• siyuan-note siyuan: before 3.6.2 — fixed in 3.6.2

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.6.2. Check the vendor advisory for mitigations.

References

• https://github.com/siyuan-note/siyuan/commit/009bb598b3beccc972aa5f1ed88b3b224326bf2a
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hhgj-gg9h-rjp7
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hhgj-gg9h-rjp7

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