T-Mobile Breach Now Affects 54.6 Million Individuals

Around six million more current and former T-Mobile customers were affected by a recently disclosed data breach, the US carrier has revealed.

The firm said it was confident it had now closed off access and egress points for the attack but admitted that the breach impacted many more individuals than at first thought.

It said 5.3 million more post-paid customers accounts were compromised, exposing names, addresses, date of births, phone numbers, IMEIs and IMSIs. That’s on top of the 7.8 million already breached.

T-Mobile said it had now also determined that phone numbers and IMEI and IMSI information were compromised for these 7.8 million individuals. That puts them at greater risk of SIM swapping fraud.

In addition, an extra 667,000 accounts of former T- Mobile customers have been accessed, compromising customer names, phone numbers, addresses and dates of birth, the carrier said.

This is on top of the 40 million former and prospective customers who had applied for credit and whose details were subsequently stolen by attackers.

Finally, up to 52,000 names related to current Metro by T-Mobile accounts may have been included in the hackers’ haul. However, no other personally identifiable information (PII) was taken from these individuals.

With the additional disclosures, the total figure for the breach now stands at 54.6 million current, former and prospective customers, up from 49 million.

Martin Riley, director of managed security services at Bridewell Consulting, said it was extremely concerning that T-M ..

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