A minor update to the initial 5.1 release has just been posted. If you are running version 5.1 you are urged to upgrade as this fixes a hole in the modify post check along with some other minor bugs.
Those users that are running earlier versions of WWWThreads and do not want to or cannot upgrade you will want to read this document
on how to patch your modifypost.pl to fix a security bug in this script.
Posted from the PHP Port Site (Post might be quirky)