Subscriptions for WooCommerce < 2.0.1 - Missing Authorization to Authenticated (Shop Manager+) Arbitrary Plugin Installation via wps_sfw_install_plugin_configuration AJAX Action

Description

The Subscriptions for WooCommerce plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 2.0.0. This is due to the plugin not properly verifying that a user is authorized to perform an action via the wps_sfw_install_plugin_configuration AJAX handler. This makes it possible for authenticated attackers, with shop manager-level access and above, to install and activate arbitrary WordPress.org plugins.