Input validation vulnerability in Ledenbeheer 2.1.0

The Ledenbeheer plugin for WordPress, which helps manage members, is at risk for a security issue called Stored Cross-Site Scripting. This can happen in versions 2.1.0 and below because the plugin does not properly filter and protect user input and output. As a result, attackers who have contributor-level or higher access can insert harmful code into pages that will run whenever someone views the page.