PHP 5.4 has been updated to the 5.4.18 version and is available for cPanel shared hosting services, you can select your php version through your cPanel as instructed in the link below:
http://secure.plusplushosting.net/knowledgebase/1090/Selecting-your-PHP-version-through-cPanel.html
The update includes fixes for security issues, including security issues CVE-2013-4113 and CVE-2013-4248
Detailed change log is available here: http://www.php.net/ChangeLog-5.php#5.4.18
- Friday, August 23, 2013