Skip to main content

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVE-2026-23847

Low
2.1/10

Summary

SiYuan is a personal knowledge management system. Versions prior to 3.5.4-dev3 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.

  • LOW
  • NETWORK
  • LOW
  • CHANGED
  • REQUIRED
  • NONE
  • LOW
  • NONE

CWE-79 - Cross Site Scripting

Cross-Site Scripting, commonly referred to as XSS, is the most dominant class of vulnerabilities. It allows an attacker to inject malicious code into a pregnable web application and victimize its users. The exploitation of such a weakness can cause severe issues such as account takeover, and sensitive data exfiltration. Because of the prevalence of XSS vulnerabilities and their high rate of exploitation, it has remained in the OWASP top 10 vulnerabilities for years.

References

Advisory Timeline

  • Published