Urgent security update – Joomla 2.5.3
On Thursday the Joomla project released version 2.5.3 to patch two serious security vulnerabilities affecting all Joomla 2.5.2 and all earlier versions including Joomla 1.6 and 1.7. 
It is CRITICAL that all Joomla instances — version 1.6, 1.7 and 2.5 — upgrade immediately to version 2.5.3.
