Cross-site scripting (XSS) vulnerability in class-s2-list-table.php in the Subscribe2 plugin before 10.16 for WordPress allows remote attackers to inject arbitrary web script or HTML via the ip parameter.

The Subscribe2 WordPress plugin before 10.38 does not have CSRF check when deleting users, which could allow attackers to make a logged in admin delete arbitrary users by knowing their email via a CSRF attack.

The Subscribe2 plugin for WordPress is vulnerable to unauthorized access to email functionality due to a missing capability check when sending test emails in versions up to, and including, 10.40. This makes it possible for author-level attackers to send emails with arbitrary content and attachments to site users.

The Subscribe2 plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 10.40. This is due to missing or incorrect nonce validation when sending test emails. This makes it possible for unauthenticated attackers to send test emails with custom content to users on sites running a vulnerable version of this plugin via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.