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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.
'hacked'. Eh. There was an API endpoint left open that allowed them to basically just spam it with no rate limiting. They used the lack of a rate limit to just pull the data out of the API that it was made to produce.
That's what most exploit-based hacks are. A developer makes a dumb mistake and then someone exploits it to do something they shouldn't be able to do.