CVE-2026-39846

SiYuan is a personal knowledge management system. Prior to 3.6.4, a malicious note synced to another user can trigger remote code execution in the SiYuan Electron desktop client. The root cause is that table caption content is stored without safe escaping and later unescaped into rendered HTML, creating a stored XSS sink. Because the desktop renderer runs with nodeIntegration enabled and contextIsolation disabled, attacker-controlled JavaScript executes with access to Node.js APIs. In practice, an attacker can import a crafted note into a synced workspace, wait for the victim to sync, and achieve code execution when the victim opens the note. This vulnerability is fixed in 3.6.4.

Affected products

Electron, Siyuan

b3log Siyuan

< 3.6.4

Fix

Available

CVSS 3.1

9.0 CRITICAL

EPSS

0.5% (42th percentile)

Weakness

CWE-79, CWE-94

NVD status

Analyzed

Published

2026-04-07

No exploit for CVE-2026-39846 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.