CVE-2026-93923

High

Description

SiYuan through 3.8.4 fails to escape heading style attributes when rendering outline and bookmark dock HTML, allowing stored cross-site scripting. Attackers can supply crafted notebooks or call administrative endpoints to inject malicious style values that execute in the Electron renderer with full system access.

SeverityHigh

CVSS8.8

Exploit probability—

ProductSiyuan

PublishedSep 19, 2026

First seenSep 19, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Vendor advisories

github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvx

Affected products

Product	Affected versions	Fixed in
siyuan-note siyuan	v ≤ 3.8.4	—

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