Joomla CMS 1.5.0 Beta1/1.5.0 Beta2/1.5.0 RC1 Installer administrator/index.php option input validation

A vulnerability was found in Joomla CMS 1.5.0 Beta1/1.5.0 Beta2/1.5.0 RC1 (Content Management System). It has been declared as critical. This vulnerability affects some unknown functionality of the file administrator/index.php of the component Installer. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.