The panel of experts said that the organisation of the final was a failure.
The kick-off was delayed by 36 minutes due to fans being robbed and tear-gassed outside the stadium.
It was initially blamed on fake tickets and supporters.
Uefa will not make any comments until its own inquiry is finished.
Fans' calm response was the main reason why there were no deaths outside the stadium, according to experts.
More than 480 testimonies by supporters and journalists at the 28 May final were examined by an independent panel.
Fans were held for several hours in a queue near the stadium before being stuck at malfunctioning turnstiles.
They were attacked by gangs with knives when they left the stadium.
They found that there had been.
The panel said that Uefa had failed to meet its responsibilities.
The Paris police have previously said they regret using tear gas against vulnerable people or those who did not cause trouble.
They apologized for the failures outside the stadium.
An independent review was commissioned by Uefa after it apologized to both Real Madrid andLiverpool fans.
The report said that a decision to take down signs meant that fans were only directed to one route to the stadium.
The panel found that as the build-up outside the Stade de France became more dangerous, a ticket checkpoint was removed, releasing fans on to the concourse, but eventOrganisers had shut some stadium gates to control the situation, which had been exacerbated by hundreds of local people trying to enter without tickets
French authorities used tear gas, with children, elderly and disabled people caught up in the chaos, and riot police were deployed despite a pre- match intelligence report stating that the fans were well-behaved in Europe.
Thousands of fans in tightly packed crowds outside the stadium were shown in hundreds of videos recorded by fans to stay calm and back up.
The 11-year-old said he thought he was going to die after being tear-gassed and that others encouraged him to get on the ground.
Grace said she felt like she couldn't breathe because her ribs were in so much pain.
The fan was taken to the hospital after the game.
The 1989 Hillsborough disaster, where a stadium crush led to the deaths of 97 fans, meant that everyone knew what to do, according to Dan Austin.
He said that people like him, who were not alive when it happened, have a local memory of what happened.
The French inquiry found that the chaos was caused by administrative errors.
The organisation had an "overarching responsibility to get it right and to care for those people who are putting their hands in their pockets and coming into those matches".
The Champions League Final: What Went Wrong? is being aired on the PBS program.
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