I think this has been discusses on the board many times...

Here's the new ruling. You can read all the new rules on the home page under misc....

9. Permit persons exercising sport pilot privileges and the
privileges of a student pilot seeking a sport pilot certificate to fly
up to an altitude of not more than 10,000 feet mean sea level (MSL) or
2,000 feet above ground level (AGL), whichever is higher.