Apple’s AirDrop can be an incredibly useful utility or just something to send memes to friends sitting nearby. Either way, it is possible that you could be sending more than you bargained for, as researchers have found that an attacker could glean the phone number and email of AirDrop users. Evidently, the researchers reported this privacy

Source: Hot Hardware – Apple AirDrop Reportedly Has A Data Leakage Vulnerability Affecting All Users