Input validation vulnerability in Multi Days Events and Multi Events in One Day Calendar 1.1.3

The Multi Days Events and Multi Events in One Day Calendar plugin for WordPress has a security issue that allows unauthorized access to the website. This vulnerability, found in all versions up to 1.1.3, occurs because of a missing or incorrect security check. This means that someone without permission could trick a site administrator into taking an action, like clicking on a link, allowing them to do something they shouldn’t be able to do.