CVE-2026-23847 LOW

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

Vendor Siyuan-Note

Product siyuan

Weakness CWE-79 · XSS

Published January 19, 2026

Last update January 20, 2026

View on NVD All CVEs

CVSS base score

2.1/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction —

Confidentiality —

Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P

What the vulnerability does

01Description

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.]

Key dates

02Disclosure timeline

January 19, 2026 CVE published

January 20, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-23847 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/79.html

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04Related CVE

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