CVE-2026-93923
8.8 HIGHpublic exploit availablePublished 2026-09-19 · Updated 2026-09-21
AI risk analysis
- Summary
- SiYuan through 3.8.4 allows attackers to inject malicious style values via crafted notebooks or administrative endpoints, leading to stored cross-site scripting (XSS) attacks.
- Exploitability
- Exploitation is relatively straightforward as attackers can inject malicious style values through notebooks or administrative endpoints.
- Blast radius
- If exploited, this flaw could lead to full system access for attackers, as the XSS executes in the Electron renderer with full system privileges.
- Detection
- No reliable host or network indicator is derivable from the published description.
- Prioritized remediation
- Upgrade to SiYuan 3.8.5 or later.
xsswebrendererstoredadmin
Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.
NVD 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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weaknesses
CWE-79
Public exploit & PoC references
- https://github.com/siyuan-note/siyuan
- https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L133
- https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L194
- https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/render.go#L71-L76
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvx
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvx
All references
- https://github.com/siyuan-note/siyuan
- https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L133
- https://github.com/siyuan-note/siyuan/blob/v3.8.4/app/src/util/Tree.ts#L194
- https://github.com/siyuan-note/siyuan/blob/v3.8.4/kernel/model/render.go#L71-L76
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvx
- https://www.vulncheck.com/advisories/siyuan-through-3.8.4-stored-xss-via-heading-style-attribute
- https://github.com/siyuan-note/siyuan/security/advisories/GHSA-928g-4hfq-qwvx
Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.
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