source: https://www.securityfocus.com/bid/10217/info

It has been reported that OpenBB is affected by a private message disclosure vulnerability. This issue is due to a design error that fails to validate user credentials.

This issue might allow an attacker to read arbitrary private messages posted to the bulletin board; limiting confidentiality.

http:/www.example.com/forum/myhome.php?action=readmsg&id=[message_id]&box=inbox