[twalkz]

> So surely the server validated that the phone number being requested was tied to the signed in user? Right? Right?? Well…no. It was possible to modify the phone number being sent, and then receive data back for Verizon numbers not associated with the signed in user.

Yikes. Seems like a pretty massive oversight by Verizon. I wish in situations like this there was some responsibility of the company at fault to provide information about if anyone else had used and abused this vector before it was responsibly disclosed.