If you're running Shoutbox on your site, install the patch here. Since this vulnerability was posted to Bugtraq, at least half a dozen skr1pt k1dd33z have attacked my server.
Yeah, I saw you, needledick:
I'm settling for public shame this time, but next time I see one freaking packet from any of you, your ISP's abuse department is getting a copy of my logs.
Biz is better.