Marc Ruef, a security researcher at SCIP, posted on Twitter a screenshot of a darknet post that put up 3.8 billion Clubhouse phone numbers for sale. The problem is even more serious than it could be, since the leak contains not only the phone numbers of social network users, but also all contacts from their phone books (access to them must be provided during registration).
Full phone number database of #Clubhouse is up for sale on the #Darknet. It contains 3.8 billion phone numbers. These are not just members but also people in contact lists that were synced. Chances are high that you are listed even if you haven’t had a Clubhouse login. pic.twitter.com/PfAkUJ0BL5
– Marc Ruef (@mruef) July 23, 2021
3.8 billion phone numbers are the largest leak, clearly one of the largest in history. Since the Clubhouse was previously very popular among the Russian-speaking audience, it is highly likely that the phone numbers of many residents of Russia and the CIS also leaked to the Network (even if they did not register with the Clubhouse).
Some Twitter users questioned the veracity of the leak, as recently the developers of the social network announced that since mid-May (since the launch of the Android version of the application) Clubhouse has added 10 million users. Even if we assume that at the moment the total number of people registered in the social network is about 30 million, it turns out that each Clubhouse user should have an average of 126 numbers in the phone book.
Be that as it may, the author of the post on the darknet offers free access to a sample of leaked data – 83.5 million phone numbers from Japan. He also states that he intends to sell the database exclusively to one buyer.
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