New Delhi, Jan. 26 -- In a fresh trouble for Facebook, phone numbers of 533 million users 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.

According to a report in Motherboard, 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.

Alon Gal, co-founder and CTO of cybersecurity firm Hudson Rock first alerted about the Telegram bot selling Facebook users' information.

"It is very worrying to see a database of that size being sold in cybercrime communities, it harms our privacy severely and will certainly be used for...