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Authy got hacked, and 33 million user phone numbers were stolen
(appleinsider.com)
This is a most excellent place for technology news and articles.
So your googling proved him right. What's embarrassing about being right?
They gained unauthorized access. From that guys definition that is a hack, no an exploit
But they are using a loophole to gain sensitive data. They did not gain unauthorised access to the system.
They absolutely gained unauthorized access to the data. Their access was not intended or sanctioned. If it was intended to be public and accessible like it was, this wouldn't be a story and they wouldn't have locked down the access.
But by the guy's definition, they also used a loophole to extract sensitive information, so it it also an exploit.