CVEvulnerability

CVE-2026-40322

9.0 CRITICAL Published 2026-04-16 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2026-04-16
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.0 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Weaknesses
CWE-79, CWE-94

Description

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.

Affected configurations

• b3log siyuan (< 3.6.4)

Related

Weakness · CWE (2)

  • CWE-79 Improper Neutralization of Input During Web Page Generation weakness
  • CWE-94 Improper Control of Generation of Code weakness

References