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


Severity Medium
Score 5.4/10


Umbraco is an ASP.NET content management system (CMS). In Umbraco.Cms package version 8.0.0 through 8.18.9, 9.0.0-beta001 through 10.6.1, and 11.0.0-rc1 through 12.0.1, a user with access to a specific part of the backoffice is able to inject HTML code into a form where it is not intended.

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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.


Advisory Timeline

  • Published