How did i get Access to Server and Database of a French Bank ?

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As part of a private bounty bug program I was able to access the server of a French “bank” ?? and its database.
 
This “bank” is very popular in France, with several million users.
 
Later and thanks to these vulnerabilities I was able to discover others and gain more bounty and points.

https://medium.com/@thibeaultchenu/how-d...ab0ed30463

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