CVE-2026-41421: Siyuan-Note Siyuan

High severity, CVSS 8.8. EPSS: 0.2% chance of exploitation in the next 30 days.

SiYuan is an open-source personal knowledge management system. Prior to 3.6.5, SiYuan desktop renders notification messages as raw HTML inside an Electron renderer. The notification route POST /api/notification/pushMsg accepts a user-controlled msg value, forwards it through the backend broadcast layer, and the frontend inserts it into the DOM with insertAdjacentHTML(...) at message.ts. On desktop builds, this is not limited to ordinary XSS. Electron windows are created with nodeIntegration: true, contextIsolation: false, and webSecurity: false at main.js. As a result, JavaScript executed from the notification sink can directly access Node APIs and escalate to desktop code execution. This vulnerability is fixed in 3.6.5.

Affected products

• Siyuan-Note Siyuan: before 3.6.5 (fixed in 3.6.5)

Published 2026-04-24. Last modified 2026-06-17.