This is what FAQ says:
I cannot send private messages!
There are three reasons for this; you are not registered and/or not logged on, the board administrator has disabled private messaging for the entire board, or the board administrator has prevented you from sending messages. Contact a board administrator for more information.
Due to the nature of the exploit, I cannot post it on github or here. My previous post was deleted and I got no answer untill several hours later. Please keep in mind I gain nothing from reporting it and I just spend my time to help you.And this the error that I get:
We are sorry, but you are not authorised to use this feature. You may have just registered here and may need to participate more to be able to use this feature.
I got my report already written but I got no safe way to send it to the development team. Its not a quick fix in database.