https://www.theregister.com/2025/11/19/whatsapp_enumeration_flaw
"Researchers in Austria used a flaw in WhatsApp to gather the personal data of more than 3.5 billion users in what they believe amounts to the 'largest data leak in history.'
The messaging platform allows users to look up others' details by inputting their phone numbers. The feature, which has been part of the platform for years, can be abused to enumerate user data, including phone number, name, and in some cases their profile image if they have one set."
Nope, Nothing's Funny about this.
https://www.theregister.com/2025/11/19/whatsapp_enumeration_flaw/