“Google is indexing the phone numbers of WhatsApp users that could be abused by threat actors for malicious activities. Even if Google Search only revealed the phone numbers and not the identities of associated users, ill-intentioned attackers could be able to see users’ profile pictures on WhatsApp and performing a reverse-image search the user’s profile picture to gather additional info on the potential victim (i.e. mining social media accounts where the victim use the same profile picture).”