HackerOne covered the vulnerability back in January.
which allowed anyone to enter a phone number or email address, and then find the associated twitterID
https://counter.social/@ecksmc/109402539512886898
I have obtained multiple files, one per phone number country code, containing the phone number <-> Twitter account name pairing for entire country’s telephone number space from +XX 0000 to +XX 9999.
Any twitter account which had the Discoverability | Phone option enabled in late 2021 was listed in the dataset.
The option referred to here is a setting which is pretty deeply hidden within Twitter’s settings, and which appears to be on by default. Here’s a direct link.