Access violation vulnerability in Popup by Supsystic 1.10.19

The Popup by Supsystic plugin for WordPress is vulnerable to a security issue that could allow attackers to access sensitive information. This plugin is used on WordPress websites, and the vulnerability affects all versions of the plugin up to and including version 1.10.19. Attackers who have access to the website with a ‘subscriber’ level account or higher can exploit this vulnerability to extract information such as subscriber email addresses.