Data breaches are now commonplace, but that doesn't make them any less serious. So when a number of users reported seeing suspicious activity on their credit cards after buying something from OnePlus' online store, the company launched an investigation to find out what really happened. Now the results are in, and it isn't looking good. As many as 40,000 customers who bought something on OnePlus.net from mid-November of 2017 up until last week potentially had their credit card info stolen by hackers.