The PHP Development Team would like to announce the immediate release of PHP 4.3.10 and PHP 5.0.3. These are maintenance releases that in addition to non-critical bug fixes address several very serious security issues. All Users of PHP are strongly encouraged to upgrade to one of these releases as soon as possible.

Download PHP 4.3.10: windows | source

Download PHP 5.0.3: windows | source

source: Techzonez