The Good Guys customers possibly affected by data breach at former third-party provider My Rewards

The Good Guys says it no longer uses the third-party company for its loyalty program.  (AAP: Julian Smith)

Up to 1.5 million customers of The Good Guys loyalty program may have had their personal information hacked in a data breach at a third-party company. 

The electronics retailer released a statement saying the IT systems of a former third-party supplier, Pegasus Group Australia, now known as My Rewards, had been improperly accessed by an unauthorised user.