CVE-2026-73053: Siyuan-Note Siyuan

Critical severity, CVSS 9.0. EPSS: 0.5% chance of exploitation in the next 30 days.

SiYuan versions before v3.7.4 contain a cross-site scripting vulnerability in the unicode2Emoji function that fails to sanitize codepoint branch output. Attackers can craft document icons with hex-encoded markup that executes in the renderer with Node integration enabled, achieving arbitrary code execution on the host system.

Affected products

• Siyuan-Note Siyuan: before 3.7.4 (fixed in 3.7.4)

Published 2026-08-15. Last modified 2026-08-26.