CVE-2026-33476 SiYuan has an Unauthenticated Arbitrary File Read via Path Traversal
Unauthenticated attackers can read arbitrary files on the server via path traversal in the SiYuan knowledge management system.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-33476?
CVE-2026-33476 is a high-severity path traversal vulnerability in B3log Siyuan, published on 20 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-33476?
3 open source packages ship an affected version, including github.com/siyuan-note/siyuan/kernel. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/siyuan-note/siyuan/kernel Go | All versions | None |
github.com/siyuan-note/siyuan/kernel Go | All versions to 0.0.0-20260317012524-fe4523fff2c8 | None |
github.com/siyuan-note/siyuan/kernel Go | All versions to 0.0.0-20260317012524-fe4523fff2c8 | None |
Products include B3log Siyuan.
How do I fix CVE-2026-33476?
Upgrade to a fixed version.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-33476 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33476 exists.
Public exploit code: 1 Nuclei template.
Other vulnerabilities in B3log Siyuan
- CVE-2026-32938 SiYuan has an Arbitrary File Read in its Desktop Publish Service
- CVE-2026-33669 SiYuan has Arbitrary Document Reading within the Publishing Service
- CVE-2026-33670 SiYuan has directory traversal within its publishing service
- CVE-2026-32767 SiYuan: Authorization Bypass Allows Arbitrary SQL Execution via Search API
- CVE-2024-53504 SQL injection in n/a
Sources
Also known as GHSA-hhgj-gg9h-rjp7, GO-2026-4802.