Yahoo on Tuesday said that every single Yahoo account was affected by a data breach that took place in 2013.
In 2016, Yahoo disclosed that more than one billion of about three billion accounts had likely been affected by the hack. In its disclosure Tuesday, the company said all accounts were likely victimized.
Yahoo included the finding in a recent update to its Account Security Update page, saying that it found out about the wider breach through new intelligence obtained during the company’s integration into Verizon Communications. Outside forensic experts assisted in the discovery, the company said.