Input validation vulnerability in WP-Cache.com 1.1.1

The WP-Cache.com plugin for WordPress is vulnerable to a type of attack called Cross-Site Request Forgery. This type of attack can be done on versions of the plugin up to and including 1.1.1. The vulnerability is caused by a lack of validation of information (called a nonce) which makes it possible for people without authentication to do something by getting an administrator to do an action, such as clicking a link.