VulnerabilityModified

CVE-2026-33476

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…

HIGH 7.5EPSS 3.26%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (3.26%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 3.1: 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS: 3.26% probability · 88th percentile
CISA KEV: Not listed
Weakness: CWE-22, CWE-73
Affected: b3log/siyuan
Source: security-advisories@github.com

References

https://github.com/siyuan-note/siyuan/commit/009bb598b3beccc972aa5f1ed88b3b224326bf2aPatch
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hhgj-gg9h-rjp7Exploit, Vendor Advisory
https://github.com/siyuan-note/siyuan/security/advisories/GHSA-hhgj-gg9h-rjp7Exploit, Vendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.