I have been trying to trace down where a circuit starts showing
voltage between my ground wire and neutral wire. I found the a
receptacle on the circuit that is correct where the neutral and ground
show 0V, and then a box which I believe is the next receptacle that
shows 120V between the ground and neutral. I have looked in both
boxes and everything looks correct.

1st Box
H-N = 120V
H-G = 120V
N-G = 0V

2nd Box
H-N = 120V
H-G = 0V
N-G = 120V

What can cause the above scenario. A short? A broken wire?
Also, is this dangerous? I think it has been like this for awhile.