Yahoo fined £250,000 for hack that impacted 515,000 UK accounts

ICO says firm 'failed to prevent' 2014 Russia-sponsored hack after 500m accounts compromised

Yahoo has been fined 250,000 over a hack from 2014 that affected more than 515,000 UK email accounts co-branded with Sky, the Information Commissioner's Office has announced.

The personal data of 500m user accounts worldwide was compromised during a state-sponsored cyber attack in 2014, which was only revealed in 2016. The stolen data included names, email addresses, telephone numbers, passwords and encrypted security questions and answers, the ICO said on Tuesday.