Yesterday I have found an enough critical vulnerability to the Zoints Tag addon for vbulletin wich has been confirmed by the developers, so if you are running Zoints Tag version 1.2.1, you should immediately upgrade to Zoints 1.2.2 here (http://www.vbulletin.org/forum/showthread.php?p=1408418).
Basically, the bug was allowing any guests to delete any tags with only 2 requests.