Twitter Now Acknowledges Security Bug That Exposed Data from 5.4+ Million Accounts

Last month we were the first to report on a breaking data security incident involving Twitter and a database compiled from 5.4 million accounts that was for sale on a cybercrime forum. Today, Twitter has formally acknowledged the security bug that caused this data breach.

Twitter has now officially acknowledged our “news report” that first broke the story about a threat actor leveraging a security vulnerability to acquire data from 5.4+ million accounts.

Last month, we spoke directly with the threat actor selling the data and we also analyzed the data sample that was being sold, confirming its legitimacy. (See the full report here.)

Today, Twitter is now acknowledging the security bug and the subsequent data breach that impacts “some accounts” — but the full number remains unknown.

Twitter goes on to explain in the report how anyone could acquire Twitter account associated with a given email or phone number.

As a result of the vulnerability, if someone submitted an email address or phone number to Twitter’s systems, Twitter’s systems would tell the person what Twitter account the submitted email addresses or phone number was associated with, if any. This bug resulted from an update to our code in June 2021.

This vulnerability is what allowed a threat actor to compile a database of Twitter account data from over 5.4 million Twitter users. The data included the Twitter user’s account handle, phone and/or email, plus other scraped data.

Below is a redacted sample that we analyzed

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