Apparently there is a flaw in the way windows handles animated cursors that could enable people to hack into your WoW account. Now I'm not sure why anyone would want an animated cursor in the first place, but de gustibus non est disputandum. It seems that malicious cursor sites can install arbitrary code on your computer along with the cursor, where it sometimes lies in waiting until you log in to WoW. At this point it pounces, records your login info, and sends it back to the hacking group responsible.
The good news is Microsoft already has a patch out to fix this vulnerability (released on April 3rd), so go download it (auto-update will get it) and you should be safe. One interesting factoid in the BBC article on this flaw is that the value of a WoW account is now greater than the value of a credit card, at $10 and $6 respectively. What's so useful about the average WoW account that it's worth $10 on the open market?
Update: You can find the download link for Microsoft's patch in our previous article on this vulnerability. Please download the patch if you have not already.