CVE-2026-100636

High

Description

SiYuan versions before v3.8.4 contain a path traversal vulnerability in the exportBrowserHTML endpoint that allows authenticated administrators to write arbitrary HTML content to index.html outside the workspace directory. Attackers can supply a folder parameter with directory traversal sequences to escape the export directory and overwrite index.html in any pre-existing kernel-writable location, enabling stored XSS or workspace defacement.

SeverityHigh

CVSS7.6

Exploit probability—

ProductSiyuan

PublishedSep 26, 2026

First seenSep 26, 2026

Weakness typeCWE-22Path traversal

How to fix

Update

siyuan-note siyuan3.8.4 or later

Vendor advisories

github.com/siyuan-note/siyuan/security/advisories/GHSA-jf98-m24w-gm9m

Affected products

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

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