CVE-2026-66396
SiYuan before v3.7.2 Stored XSS to RCE via title-img IAL
- State
- Published
- Severity
- 9.3 Critical
- Published
- Jul 27, 2026
- Updated
- Sep 17, 2026
- Reserved
- Jul 26, 2026
Description
SiYuan before v3.7.2 fails to escape the title-img Individual Attribute List value when rendering Gallery and Kanban cover images, allowing stored cross-site scripting via unescaped style attribute interpolation. Attackers with editor permissions can inject onload handlers that execute arbitrary code in the Electron renderer with full Node.js access when victims open affected documents.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H | VulnCheck |
| 3.1 | 8.4 High | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Products
| Product | Versions |
|---|---|
siyuansiyuan-note |
|
References
- GitHub Security Advisory (GHSA-5rxg-wh59-mg34)vendor-advisory
- VulnCheck Advisory: SiYuan before v3.7.2 Stored XSS to RCE via title-img IALthird-party-advisory
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