Carphone Warehouse has become the latest telecoms provider to be fined by the UK’s privacy regulator for failing to prevent a data breach.
The Information Commissioner’s Office (ICO) fined the company £400,000 over the 2015 hack, in which attackers got access to the personal data of over three million customers and 1,000 employees.
Customer data accessed in the attack included names, addresses, phone numbers, dates of birth, marital status and historical payment card details.
Details of employee names, phone numbers, postcodes and car registrations were also accessed.
The ICO investigation found that Carphone Warehouse had failed to carry out routine security testing and to update software systems, and had not implemented measures to identify and delete historical data.
These failures violated the UK’s Data Protection Act.
The Commissioner acknowledged however that the retailer had taken steps to fix some problems and protect those affected.
Elizabeth Denham, Information Commissioner, said: “A company as large, well-resourced, and established as Carphone Warehouse, should have been actively assessing its data security systems, and ensuring systems were robust and not vulnerable to such attacks.
“Carphone Warehouse should be at the top of its game when it comes to cyber-security, and it is concerning that the systemic failures we found related to rudimentary, commonplace measures.”
The fine comes ahead of the introduction of the EU’s General Data Protection Regulation on 25 May, which will impose more stringent data security requirements on companies.
Carphone Warehouse’s fine equals that imposed on TalkTalk in 2016, at the time a new record.
Almost 157,000 people had their personal details accessed by a hacker in October 2015 after TalkTalk’s website was breached.