Resolving Simple Cross-Site Scripting Flaws with Veracode Fix

In the last blog on fixing vulnerabilities with Veracode Fix, we looked at SQL Injection remediation in a Java application. Since then, we have released Fix support for Python (and PHP) and launched a new VS Code plugin that includes support for Fix.
It seems appropriate, therefore, to look at resolving a problem in a Python app using Veracode Fix in the VS Code IDE. This time let’s examine a simple cross-site scripting (XSS) weakness.
What is an XSS Vulnerability?
An XSS vulnerability occurs when an attacker injects malicious code into a trusted website, which is then executed by unsuspecting users. This can lead to unauthorized access, data theft, or manipulation of user sessions. XSS vulnerabilities are commonly found in input fields, comments sections, or poorly validated user-generated content.  A simple demonstration example is often to enter the following text in a user input field:

If an application does not sanitize…