High 8.8Published Sep 18, 2026

CVE-2026-93923SiYuan through 3.8.4 Stored XSS via Heading Style Attribute

Updated under an hour ago (Oct 27, 2026, 5:10 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for siyuan-note siyuan

Exploited in the last 30 days

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.

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Sep 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

siyuan-note siyuan siyuan_note:siyuan (from the name)	through 3.8.4	CNA record

References

References

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvx	vendor-advisory
https://github.com/siyuan-note/siyuan	product
https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/render.go#L71-L76	technical-description
https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L133	technical-description
https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L194	technical-description
https://www.vulncheck.com/advisories/siyuan-through-3.8.4-stored-xss-via-heading-style-attribute	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.