CVE-2026-40322

SiYuan is an open-source personal knowledge management system. In versions 3.6.3 and below, Mermaid diagrams are rendered with securityLevel set to "loose", and the resulting SVG is injected into the DOM via innerHTML. This allows attacker-controlled javascript: URLs in Mermaid code blocks to survive into the rendered output. On desktop builds using Electron, windows are created with nodeIntegration enabled and contextIsolation disabled, escalating the stored XSS to arbitrary code execution when a victim opens a note containing a malicious Mermaid block and clicks the rendered diagram node. This issue has been fixed in version 3.6.4.

• CWE-79
• CWE-94

• https://github.com/siyuan-note/siyuan/releases/tag/v3.6.4Release Notes
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-x63q-3rcj-hhp5Third Party Advisory
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-x63q-3rcj-hhp5Third Party Advisory

Published

Apr 16, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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