Community Edition 1.9.3 and SUPEE-8788 resolve multiple security issues, including critical vulnerabilities with certain payment methods and Zend Framework libraries. Community Edition 1.9.3 also includes over 120 product quality enhancements and support for PHP 5.6. Learn more about the security issues at https://magento.com/security/patches/supee-8788 and functional updates at http://devdocs.magento.com/guides/m1x/ce19-ee114/ce1.9_release-notes.html#ce19-1930 