source: https://www.securityfocus.com/bid/52474/info

Max's PHP Photo Album is prone to a local file-include vulnerability because it fails to sufficiently sanitize user-supplied input.

An attacker can exploit this vulnerability to view files and execute local scripts in the context of the webserver process. 

http//www.example.com/maximage/showImage.php?id=../../../../../../../../../../../../etc/passwd%00