CVE-2026-93923SiYuan through 3.8.4 Stored XSS via Heading Style Attribute
Updated under an hour ago ()
Does this affect you?
It affects siyuan-note siyuan. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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
siyuan-note siyuan siyuan_note:siyuan (from the name) | through 3.8.4 | CNA record |
References
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvxvendor-advisory
- https://github.com/siyuan-note/siyuanproduct
- https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/render.go#L71-L76technical-description
- https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L133technical-description
- https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L194technical-description
- https://www.vulncheck.com/advisories/siyuan-through-3.8.4-stored-xss-via-heading-style-attributethird-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.