A serious vulnerability in the WP eCommerce Plugin was announced within the last 24 hours (321st Oct 2014) . A fix has been released and some hosting companies are already auto-upgrading customers to the newest version.
Upgrade to 3.8.14.4 of WP eCommerce immediately if you use this plugin. Please spread the word because with almost 3 million downloads this is a very popular plugin.
Web Security Issues