Block Plugin Update <= 3.3.1 - Cross-Site Request Forgery via bspu_plugin_select.php

The Block Plugin Update plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 3.3.1. This is due to missing or incorrect nonce validation on the bspu_plugin_select.php file. This makes it possible for unauthenticated attackers to choose which plugins will be blocked from updating via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.