CVE-2026-66395
SiYuan Desktop before v3.7.2 Reflected XSS to RCE via siyuan Protocol
- State
- Published
- Severity
- 9.4 Critical
- Published
- Jul 27, 2026
- Updated
- Sep 17, 2026
- Reserved
- Jul 26, 2026
Description
SiYuan desktop before v3.7.2 contains a reflected cross-site scripting vulnerability in the bazaar plugin readme handler that allows attackers to execute arbitrary code by crafting a malicious siyuan:// deep link. Attackers can inject HTML payloads via the plugin name parameter that execute with full Node.js access through insertAdjacentHTML rendering in an insecurely configured Electron renderer.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.4 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H | VulnCheck |
| 3.1 | 9.6 Critical | CVSS:3.1/AV:N/AC:L/PR:N/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-6gx2-8gcr-x83f)vendor-advisory
- VulnCheck Advisory: SiYuan Desktop before v3.7.2 Reflected XSS to RCE via siyuan Protocolthird-party-advisory
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