Why does your 2007 Camry leak inside the car every time it rain's?

One of rubber gaskets does not do its work properly. Your car must have some warranty left (depends on mileage). It has warranty, just bring the car a dealer's place and let them handle it.

If you do not have warranty, you need to find out where exactly the leak is. It can be the sunroof, the windshield or the gasket around the air heater intake. When you find the leak fix fix liquid rubber (gasket maker) or silicon which you can get in almost any auto parts store.