CVE-2026-33066

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.

Affected products

Dompurify, Electron, Siyuan, Lute

b3log Siyuan

< 3.6.1

Fix

Available

CVSS 3.1

9.0 CRITICAL

EPSS

0.6% (45th percentile)

Weakness

CWE-79

NVD status

Analyzed

Published

2026-03-20

No exploit for CVE-2026-33066 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.