Vulnerability · Published Sep 26, 2026 · Assigned by VulnCheck

CVE-2026-100638SiYuan before v3.8.4 Path Traversal via setNotebookIcon

High 7.6

In plain English

A high-severity security flaw in siyuan from siyuan-note. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 46% of all known vulnerabilities).

Severity (CVSS 3.1)7.6High

Exploit odds (30 days)0.6%top 53.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
siyuan-note	siyuan	0 – before 3.8.4

Weakness: CWE-73 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:L

References

GitHub Security Advisory (GHSA-6h8x-6mph-7438) vendor-advisory
VulnCheck Advisory: SiYuan before v3.8.4 Path Traversal via setNotebookIcon third-party-advisory