Input validation vulnerability in Easy Quiz Maker 1.5

The Easy Quiz Maker plugin for WordPress is vulnerable to a security issue called Stored Cross-Site Scripting. This means that if someone uses a particular version of the plugin, up to and including version 1.5, malicious code can be inserted into the plugin. This code can be executed whenever a user visits a page with the malicious code, without the user having to do anything. To protect against this, the plugin should be updated to a newer version that has better security measures.