Updated versions of the recent SUPEE-7405 patch and Community Edition 1.9.2.3 release are now available. The updates add support for PHP 5.3 and address issues with upload file permissions, merging carts, and SOAP APIs experienced with the original release. They DO NOT address any new security issues, but all merchants should upgrade to the new versions to maintain compatibility with future releases. You can learn more about the updates at https://magento.com/security/patches/supee-7405