🛡️ CVE-2026-33066
🔴 CVSS 9.0 — Critical ✅ No Known Exploit CWE-79 NVD
9.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

SiYuan is a personal knowledge management system. In versions 3.6.0 and below, the backend renderREADME function uses lute.New() without calling SetSanitize(true), allowing raw HTML embedded in Markdown to pass through unmodified. The frontend then assigns the rendered HTML to innerHTML without any additional sanitization. A malicious package author can embed arbitrary JavaScript in their README that executes when a user clicks to view the package details. Because SiYuan's Electron configuration enables nodeIntegration: true with contextIsolation: false, this XSS escalates directly to full Remote Code Execution. The issue was patched in version 3.6.1.

Details

Severity Critical
CVSS Score 9.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
CWE CWE-79
Public Exploit ✅ No
Source NVD
Published 2026-03-18
Updated 2026-06-15
Modified 2026-03-23

Affected Packages

Software From version Fixed in
github.com/siyuan-note/siyuan/kernel — —
siyuan — 3.6.1

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