CVE-2026-33476

Name: CVE-2026-33476
Creator: NVD / NIST
Published: 2026-03-20T23:16:48.137+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.26%

Last modified Jun 17, 2026

CVE-2026-33476 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 3.26% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

3.26%

86.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
B3log	Siyuan	< 3.6.2

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

Timeline

Published: Mar 20, 2026
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2026-33476?

How severe is CVE-2026-33476?

CVE-2026-33476 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.26% probability of exploitation in the next 30 days.

How do I fix CVE-2026-33476?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-33476?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST