CVE-2026-31809 - Vulnerability Analysis

Overview

SiYuan < 3.5.10 contains a reflected XSS caused by improper sanitization of javascript: href attributes allowing ASCII control characters to bypass prefix checks in SVG sanitizer, letting unauthenticated attackers execute JavaScript via /api/icon/getDynamicIcon.

Severity & Score

Impact

Unauthenticated attackers can execute arbitrary JavaScript in users' browsers, leading to session hijacking or other client-side attacks.

Mitigation

Update to version 3.5.10 or later.

References

• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-pmc9-f5qr-2pcr

Related Resources

• Vulnerability Intelligence Dashboard
• Credential Scanner