Users utilizing WordPress and installed the WP Super Cache plugin, are being urged to update to the latest version of the plugin (1.4.4) as soon as possible. A cross site scripting (XSS) vulnerability has been found in plugin versions prior to 1.4.4 that could give potential attackers access to your WordPress.
If you are utilizing WordPress and have WP Super Cache installed, ensuring that you're protected only takes a moment. Should you require more information on updating, check the Knowledge Base articles at the following addresses for additional information as well as screenshot tutorials to assist with updating WordPress plugins.