Who is the undisputed WWE champion?

In 2011, during the feud between CM Punk and John Cena, the WWE Title was briefly named the Undisputed Championship leading up to the fight at Summerslam. CM Punk won this title at Summerslam, so therefore, does this make Punk the Undisputed Champion? I think that's for you to decide as it was not made clear after Punk's departure that night.