WhatsApp has come under serious attention after researchers uncovered a security failure that exposed the phone numbers of around 3.5 billion users worldwide. The findings show that a weakness in the platform allowed automated systems to pull user details by simply checking number availability. According to the research team from the University of Vienna, the issue has existed since 2017, but Meta has not acknowledged it publicly until now. This discovery has raised concerns because WhatsApp is one of the most used apps in India and is trusted for private chats and personal communication by people. Experts say such exposure of phone numbers in large numbers increases risks around privacy, spam, and targeted scams.

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How the researchers found

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