Every year thousands of data breaches occur, as we can read in the daily news. The root causes of the breaches range from organizational issues to technical flaws. A new category of attacks emerged a few years ago: ‘credential stuffing’. According to F5, ‘credential stuffing and brute force attacks have been the biggest threats for financial services recently, and the trend shows no sign of slowing’. According to Akamai, ‘hackers have targeted the gaming industry by carrying out 12 billion credential stuffing attacks against gaming websites within the 17-month period analyzed’. Nowadays credential stuffing attacks are considered among the top digital threats. But what exactly is credential stuffing?