Input validation vulnerability in Lana Email Tester 1.0.0

The Lana Email Tester plugin for WordPress has a security vulnerability that could allow someone to send emails from the website without permission. This vulnerability is present in all versions of the plugin up to and including version 1.1.0. The vulnerability is caused by the plugin not having the proper security measures in place such as nonce validation and a permissions check. It is possible for an unauthenticated attacker to send emails from the site by tricking a site administrator into clicking on a link or making a certain type of post request. Authenticated users can also exploit this vulnerability without needing an administrator to do anything.