Severity:

CRITICAL RISK

(9.0)

Stored XSS to Arbitrary Code Execution via Mermaid Diagrams (CWE-79) in SiYuan Desktop

CVE-2026-40322

Published:

Apr 16, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Vulnerability Type

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79;CWE-94

Impact:

Arbitrary Code Execution on Desktop via Stored XSS

Severity:

CRITICAL RISK

(9.0)

CVSS Version:

3.1

Vulnerability Type

Category:

Cross-Site Scripting (XSS)

CWE:

CWE-79;CWE-94

Impact:

Arbitrary Code Execution on Desktop via Stored XSS

Severity:

CRITICAL RISK

(9.0)

CVSS Version:

3.1

Catch This CVE While Code Is Being Written

Detect vulnerable code directly in pull requests, so CVEs are fixed before merge.