Can someone who is registered on your forum, introduce a crap or malware by posting?

[Quartzite]

Something very strange happened this evening. Someone who had registered with my forum made a post and then right after that, it is as though the forum was rolled back 8 days. In fact, it was not just my forum. It was all of my websites including my main website. I am trying to figure this out. I am with HostGator. When I talked with technical support, he said it looked like some kind of behavor in the CMS. Can someone introduce a crap or malware via posting? Any help you can give me...

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