Prevent [IMG] tag in reputation posting / Flaw being exploited

[jadkar]

Hello, I'm sure this is not a big deal and I'm hoping someone can let me know how to do this real quick because it's becoming a disaster.

I run a site with primarily kids on it. Someone discovered a flaw in vBulletin and have exploited it. Now 20-30 of these users are out of control and making a mess of the reputation system. I have disabled it for now, but I need to prevent them from doing this. Here's what's going on.......

They figured out when leaving "rep" for someone they can use the [IMG] tag in the comment. When they do they link to a photo that's super huge, like 8000x8000. Once this is done the poor user who received the "rep" can never load his "user CP", or it loads but takes forever. Each time this happens the only way for me to get rid of it is to actually go to the SQL database and do a search for the entry and delete it!!! There's no other way within the UserCP besides deleting all his/her "rep".

So yes, this is a mess. What I'm looking for is a way to just remove the ability of using the [IMG] tag when posting reputation.

Please help