Input validation vulnerability in Image Slider 1.1.125

A popular add-on for WordPress called Image Slider has a security issue that allows hackers to inject malicious code into web pages. This can happen on any version of the plugin up to version 1.1.125, and is caused by not properly cleaning up user input and output. This means that attackers with certain permissions can add harmful scripts to pages, which will execute when someone views the page. This only affects WordPress sites that have multiple sites or have disabled a security feature called unfiltered_html.