It always sucks when this kind of thing happens, but thanks to a number of people around the internet with nothing better to do, some PSN users seem to have had their accounts hacked. While one user has claimed the issue is widespread, it seems more likely that this is a problem for a smaller contingent of people over the last two days.
Many of the people report similar events; their account email was changed without their permission and the credit card attached to the account was charged. Neverwinter gems were also a common thing being purchased in these instances, even if the user had never played the game.
Fortunately, many of the users have also said that simply calling Sony's customer support resolved the problem in about 20 minutes, and people got their money back. If this has happened to you, don't hesitate to call Sony's customer support at 1 (800) 222-7669.
Source: [reddit]
