CVE-2026-100638 SiYuan before v3.8.4 Path Traversal via setNotebookIcon
Authenticated administrators can exploit path traversal in SiYuan to write files outside the workspace, potentially leading to arbitrary file creation or code execution.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100638?
CVE-2026-100638 is a high-severity path traversal vulnerability in siyuan-note siyuan, published on 26 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
SiYuan versions before v3.8.4 contain a path traversal vulnerability in the setNotebookIcon endpoint that allows authenticated administrators to create arbitrary directory trees and write files outside the workspace boundary. Attackers can supply directory traversal sequences in the notebook parameter to escape the workspace data directory and write conf.json files to arbitrary locations accessible by the kernel process.
Weakness: CWE-73
Which versions are affected by CVE-2026-100638?
How do I fix CVE-2026-100638?
No fix has been published for CVE-2026-100638 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-100638 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100638 exists.
Sources
Also known as GHSA-6gvc-7gr4-55rh, GHSA-6h8x-6mph-7438.