source: https://www.securityfocus.com/bid/22733/info

Pagesetter is prone to a local file-include vulnerability because it fails to properly sanitize user-supplied input.

Exploiting this issue may allow an unauthorized user to view files and execute local scripts.

Pagesetter 6.3.0 beta 5 and prior versions are vulnerable to this issue. 

http://www.example.com/index.php?module=Pagesetter&type=file&func=preview&id=../../../../../../../../../etc/passwd%00