Summary
The remote host is running a version of phpBB older than 2.0.9.
There is a flaw in the remote software which may allow anyone to inject arbitrary SQL commands, which may in turn be used to gain administrative access on the remote host or to obtain the MD5 hash of the password of any user.
One vulnerability is reported to exist in 'admin_board.php'. The other pertains to improper characters in the session id variable.
Solution
Upgrade to the latest version of this software