A Russian group has hacked 1.2 billion usernames and passwords belonging to more than 500 million email addresses, according to Hold Security – a US firm specialising in discovering breaches.
Hold Security described the hack as the “largest data breach known to date”.
It claimed the stolen information came from more than 420,000 websites, including “many leaders in virtually all industries across the world”.
Hold Security did not give details of the companies affected by the hack.
“They didn’t just target large companies; instead, they targeted every site that their victims visited,” Hold Security said in its report.
“With hundreds of thousands of sites affected, the list includes many leaders in virtually all industries across the world, as well as a multitude of small or even personal websites.”