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Reference

HTML Injection Warning

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Message

Ensure the expression is protected by using EncodeHTML(), EncodeJavascript(), or SanitizeHtml() from the Sanitization extension, to avoid security flaws.

Cause

The expression mentioned in the warning has a value that comes from the end-user input and that is susceptible to contain malicious content.

Recommendation

Do one of the following:

Enable the Escape Content property of the expression.
Use the EncodeHtml() built-in function to replace all HTML reserved characters by their escaped counterpart.
Use the EncodeJavascript() built-in function to replace all JavaScript reserved characters by their escaped counterpart so they can be included in a JavaScript string.
Use the SanitizeHtml() function from the Sanitization extension module to ensure that the value entered by the end-user does not contain any malicious content.
Use the EncodeUrl() built-in function to replace all URL invalid characters by their percent-encoded counterpart.