What’s Vulnerable › Vulnerabilities

CVE-2026-23847: SiYuan Vulnerable to Reflected Cross-Site Scripting (XSS) via /api/icon/getDynamicIcon

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-01-19 · updated 2026-06-17
• Weakness: CWE-79

Description

SiYuan is a personal knowledge management system. Versions prior to 3.5.4 are vulnerable to reflected cross-site scripting in /api/icon/getDynamicIcon due to unsanitized SVG input. The endpoint generates SVG images for text icons (type=8). The content query parameter is inserted directly into the SVG <text> tag without XML escaping. Since the response Content-Type is image/svg+xml, injecting unescaped tags allows breaking the XML structure and executing JavaScript. Version 3.5.4 patches the issue.]

Affected products

• siyuan-note siyuan: before 3.5.4 — fixed in 3.5.4

How to fix

Upgrade to a fixed version: siyuan-note siyuan 3.5.4. Check the vendor advisory for mitigations.

References

• https://github.com/siyuan-note/siyuan/commit/5c0cc375b47567e15edd2119066b09bb0aa18777
• https://github.com/siyuan-note/siyuan/issues/16844
• https://github.com/siyuan-note/siyuan/security/advisories/GHSA-w836-5gpm-7r93

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