Many users are reporting that after updating their board to phpBB 3.0.10, their forums are filling up with spambots.

Here is a public discussion:
http://www.phpbb.com/community/viewtopic.php?f=46&t=2148139

I am the owner of the Italian support forum of phpBB, and also in my forum users are complaining of this problem after updating their board to phpBB 3.0.10.

It's possible that there is a bug that allow easy registration to spambots?