533 million users phone number are currently being sold via a bot on encrypted messaging platform Telegram, which came from a Facebook vulnerability that was patched by the social network in 2019.

A report in Motherboard stated, the person selling the database full of Facebook users phone numbers (it’s $20 per number) lets customers lookup those numbers by using an automated Telegram bot.

Although data is a bit old but it still presents a cybersecurity and privacy risk to those whose phone numbers may be exposed. Facebook said data is related to 2019 Vulnerability that been fixed

The Telegram bot running since Jan 12th lets users enter either a phone number to receive the corresponding user’s Facebook ID, or visa versa, claiming to have details of users from 15 countries’

The initial results from the bot are redacted, but users can buy credits to reveal the full phone number. One credit is $20, with prices stretching up to $5,000 for 10,000 credits.

Last month , reports surfaced that a bug exposed the personal information like email addresses and birthdays of Instagram users.The vulnerability could have been used to spy on Facebook users via Android phones.