CVE-2026-54759: Siyuan-Note Siyuan

High severity, CVSS 8.7. EPSS: 0.4% chance of exploitation in the next 30 days.

SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, Lute's HTML sanitizer does not remove <iframe> elements. Combined with the SiYuan Electron client's permissive security configuration, an attacker can include a malicious <iframe> in a Bazaar package README that executes arbitrary commands on the victim's machine when the package details are viewed. No package installation is required. This vulnerability is fixed in 3.7.0.

Affected products

• Siyuan-Note Siyuan: before 3.7.0 (fixed in 3.7.0)

Published 2026-06-24. Last modified 2026-06-25.