Three Mobile hit by a massive data hack in the UK

Attackers managed to access a database of millions customers

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File photo. Image: Nick Ansell / PA Wire/Press Association Images

Three Mobile, one of the UK's largest phone providers, has confirmed a major cyber security breach, which has put the personal data of millions of customers at risk. 

The company confirmed that hackers successfully accessed its "customer upgrade database" by using an employee login. Private information pertaining to two thirds of the company's nine million customers is said to be at risk. 

The breach was confirmed late on Thursday evening, with Three Ireland issuing a statement to assure Irish customers. 

"Three UK has been the victim of an attack. Just to confirm Three Ireland is not affected. The system impacted is used solely by Three UK."

The UK arm of the company has declined to confirm if data has been stolen or exactly how many people have been impacted. Three UK stated that customer's financial information was not accessed during the hack, but names, phone numbers, addresses and dates of brith were. 

It was explained that that the hackers had been accessing customer accounts, upgrading them and then intercepting the delivery of the new phones. It's thought that this was with a view to selling them on. 

Customers whose data was involved have not yet been informed.