Subscribe2 <= 10.37 - Cross-Site Request Forgery

The Subscribe2 plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 10.37. This is due to missing or incorrect nonce validation on the process_bulk_action function. This makes it possible for unauthenticated attackers to delete users, via forged request granted they can trick a site administrator into performing an action such as clicking on a link.