The latest current stable release of PHP 5.2.2 and PHP 4.4.7 fixes a lot of security issues, especially those that were disclosed on the Month of PHP Bugs. It also fixes the header injections on PHP’s mail() functions which was discussed on my previous article on e-mail security.
Its a highly recommended patch, since most of these vulnerabilities have been exposed publicly. You can download the latest versions of PHP at these links:
PHP 5.2.2 / PHP 4.4.7 Download [php.net]
