Anonymous and secure Telegram, in all likelihood, in fact was not so invulnerable. Recently, a critical vulnerability has been found in the messenger, with the help of which you can find out all the information about the user, including the name and phone number, using only the user's account.
The Cryptoscan program, created by the Center for Legitimacy Studies, issues all the user data to Telegram using the messenger's vulnerability. According to its creators, it is already used by the bodies of the Ministry of Internal Affairs and the FSB to search offenders in the Internet.
At the moment, the representatives of the messenger did not comment on the situation.