So I accidentally ran over the curb with the rear right wheel when I was making a turn several days ago. I only went over it at about 10 MPH, but I pulled over to check if everything was okay, I didn't see any damage. The problem is that I hear a slight creaking/rattling noise coming from the right rear, and I don't think it's the panels either.

What could I have broken?

i wouldnt of thought that was fast enougth to cause a lot of damage try checking the link rods and spring is the noise when rolling or do get it if you bounce up and down on suspension

It's when I'm rolling, not in coordination with any spring action...just sounds like something is rattling.