PHP-Nuke 5.5 and 6.0: Path Disclosure

Product - PHP-Nuke + Version - 5.5, 6.0 other versions not tested jet + Website - http://www.phpnuke.org + Problems - Path Disclosure + Explanation: The fault happens in the file print.php, which this including in the modulos 'News' and 'AvantGo', in the same one is checked that the variable $sid...