Input validation vulnerability in Quiz Maker 6.5.9.8

The Quiz Maker plugin for WordPress has a security flaw that allows hackers to insert harmful code into the website. This can happen because the plugin does not properly clean and protect the data entered in the admin settings. As a result, attackers who have high-level access to the website can add code that will run when a user visits a certain page. This only affects websites that have multiple sites or have disabled a security feature called unfiltered_html.