WhatsApp’s security flaw recently exposed the phone numbers of 3.5 billion users, raising serious concerns about data privacy. Researchers from Austria demonstrated how they could scrape phone numbers at a staggering rate of nearly 100 million per hour, using a simple method via WhatsApp Web. This vulnerability allowed access not only to phone numbers but also to profile photos for 57% of users and profile texts for 29%, all without advanced hacking techniques. Meta, WhatsApp's parent company, was aware of this issue since 2017 but failed to address it for years. After the researchers reported the problem in April 2023, Meta implemented rate-limiting measures in October to curb mass data scraping. However, the delay in addressing the vulnerability left users exposed to potential abuse during that time. Meta claimed that the exposed data was "basic publicly available information" and there was no evidence of malicious exploitation. Still, users are urged to review their privacy settings and be cautious about sharing personal information, especially since this isn't the first data breach WhatsApp has faced; a leak in 2022 affected 32 million users in the U.S. alone.