The Stream plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 4.0.1. This is due to missing or incorrect nonce validation on the network_options_action() function. This makes it possible for unauthenticated attackers to update arbitrary options that can lead to DoS or privilege escalation via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
https://plugins.trac.wordpress.org/changeset/3139815/stream/trunk/classes/class-network.php
https://plugins.trac.wordpress.org/browser/stream/tags/4.0.1/classes/class-network.php#L353