High severity8.8NVD Advisory· Published Sep 19, 2026· Updated Sep 21, 2026
CVE-2026-93923
CVE-2026-93923
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1- Range: <=3.8.4
Patches
Vulnerability mechanics
References
5- github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.tsnvd
- github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.tsnvd
- github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/render.gonvd
- github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvxnvd
- www.vulncheck.com/advisories/siyuan-through-3.8.4-stored-xss-via-heading-style-attributenvd
News mentions
1- Siyuan Note: Six XSS and SQLi Vulnerabilities Disclosed Together, Patched in v3.8.4Vypr Intelligence · Sep 19, 2026