More than eight million user accounts in the UK have been affected by the Yahoo data breach.
The figure was given by the Information Commissioner’s Office (ICO) after the US internet firm revealed that details of 500 million users had been stolen.
The ICO described the scale of the breach as “staggering”.
Sky, which uses Yahoo as an email provider, is encouraging email holders to change passwords and security questions, in line with the US company’s advice.
Information Commissioner Elizabeth Denham said: “The vast number of people affected by this cyber attack is staggering and demonstrates just how severe the consequences of a security hack can be.
“The US authorities will be looking to track down the hackers, but it is our job to ask serious questions of Yahoo on behalf of British citizens and I am doing that today.
“We don’t yet know all the details of how this hack happened, but there is a sobering and important message here for companies that acquire and handle personal data.
“People’s personal information must be securely protected under lock and key – and that key must be impossible for hackers to find.”
The commissioner could levy fines of up to £500,000 against the company for not protecting its customers’ information
Yahoo is under pressure to release more details on the attack and explain why it took so long to detect.
Written by DFGR Research Team – www.dfgr-ltd.com
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