T-Mobile issued the update on Wednesday.

The fallout from T-Mobile's latest data breach is going from bad to worse. In an update issued Friday, the mobile carrier reported that hackers had illegally accessed one or more associated customer names, addresses, dates of birth, phone numbers, IMEIs and IMSIs of 5.3 million current postpaid customers. T-Mobile also said it had identified an additional 667,000 accounts of former customers that were accessed, with customer names, phone numbers, addresses and dates of birth compromised.

See also: How to protect your personal data after a breach

The new numbers push the total number of people affected by the breach past the 50 million mark.

T-Mobile noted that in its most batch of discoveries, affected customers' driver's license details and Social Security numbers weren't illegally accessed.

On Wednesday, the company said in a post that the personal data of more than 40 million customers was stolen by hackers. The data, which belonged to former and prospective customers, included names, dates of birth, driver's license details and Social Security numbers. 

In addition, the company said that the hackers had swiped data belonging to approximately 7.8 million current postpaid customers. It also confirmed that 850,000 active T-Mobile prepaid customer names, phone numbers and account PINs were exposed.

Vice reported Friday that the company is now facing a class-action lawsuit over the breach, based on papers filed in a Washington court.