CVE-2026-33476

SiYuan has an Unauthenticated Arbitrary File Read via Path Traversal

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

siyuan-note · siyuan

CVSS v3.1 GITHUB

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

3.06% chance of exploitation in the next 30 days, 87th percentile

Nuclei

high · CWE-22

Published

2026-03-20

Updated

2026-03-23

Proof-of-concept exploits (1)

• advisories/GHSA-hhgj-gg9h-rjp7

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-33476.yaml

Security advisories

• siyuan-note/siyuan/security/advisories/GHSA-hhgj-gg9h-rjp7
• siyuan-note/siyuan/commit/009bb598b3beccc972aa5f1ed88b3b224326bf2a

References

• CVE Record
• NVD entry