CVE-2026-100638

High

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.

SeverityHigh

CVSS7.6

Exploit probability—

ProductSiyuan

PublishedSep 26, 2026

First seenSep 26, 2026

Weakness typeCWE-73CWE-73

How to fix

Update

siyuan-note siyuan3.8.4 or later

Vendor advisories

github.com/siyuan-note/siyuan/security/advisories/GHSA-6h8x-6mph-7438

Affected products

Product	Affected versions	Fixed in
siyuan-note siyuan	v < 3.8.4	3.8.4

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