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July 22, Restore Privacy reported that Twitter was hacked due to a security breach, and the contact information of a total of 5.4 million accounts was leaked. The leaked 5.4 million accounts included Twitter IDs associated with them. Phone numbers and email information were sold on a hacking forum for $30,000.

Today, Twitter has officially confirmed that the attack has occurred and the 0-day vulnerability has been patched.

Twitter officials said that the vulnerability had been learned of through its bug bounty program HackerOne as early as January this year, and that the vulnerability gradually emerged after its code was updated in June 2021. While the issue was resolved earlier this year, Twitter said it did not consider the possibility that attackers already possessed the data.

IT Home has learned that, according to previous reports, a total of 5,485,636 Twitter account profiles, including mobile phone numbers, locations, URLs, profile pictures and other data information, were stolen.

Twitter said it was notifying every affected user, but officials could not fully confirm which accounts were exposed due to the security breach. Additionally, while passwords were not part of the data breach, Twitter advised users to turn on two-factor authentication for their accounts.