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

CVE-2023-49279

Medium
5.4/10

Summary

Umbraco is an ASP.NET content management system (CMS). A user with access to the back office can upload SVG files that include scripts. If the user can trick another user into loading the media directly in a browser, the scripts can be executed. Some workarounds are available. Implement the server-side file validation or serve all media from a different host (e.g cdn) than where Umbraco is hosted. This vulnerability affects Umbraco.Cms package versions 7.0.0-alpha through 7.15.10 ,8.0.0 through 8.18.8, 9.0.0-beta001 through 10.6.1, 11.0.0-rc1 through 11.4.2, and 12.0.0-rc1 through 12.1.2.

  • LOW
  • NETWORK
  • LOW
  • CHANGED
  • REQUIRED
  • LOW
  • 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