Input validation vulnerability in xili-language 2.21.2

The xili-language plugin for WordPress has a security issue that affects versions up to 2.21.2. This vulnerability is called Reflected Cross-Site Scripting and it happens because the plugin does not properly clean and protect user input. This means that someone who is not logged in can insert harmful code into a webpage and make it run if they can trick another person into clicking on a specific link.