Even if you upgraded your phpBB to 11, you still may be at risk under certain PHP versions. If you aren't sure, do a "php -v" and update if needed now!
from phpBB.com:
1) If you maintain your own server be sure to upgrade to the newest available release of PHP (both versions 4 and 5). Be aware that at this time phpBB 2.0.x has problems functioning under PHP5 without modification.
2) If you pay for hosting ensure you hosting provider has upgraded thier installation of PHP (again remember that phpBB 2.0.x and other scripts will not function under PHP5 without modification).
