Venmo is a PayPal-owned money transfer app that’s soared in popularity recently, as it allows you to settle bills and pay friends with just a couple of taps. In addition to sending money, you can request that people pay you. And until recently, anyone could drain a Venmo account on a locked iPhone, just by using Siri. Awkward. The flaw was discovered by Martin Vigo, a product security engineer for SalesForce. It takes advantage of the fact that iOS lets you perform a limited array of actions, like sending text messages and initiating phone calls, without actually having to unlock the phone with a PIN number or…

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