Yahoo issues new warning of potentially malicious activity on accounts

Hackers potentially accessed accounts between 2015 and 2016, and the warning comes two months after saying data from 1bn users was compromised in 2013

Yahoo is warning users of potentially malicious activity on their accounts between 2015 and 2016, the latest in a string of cybersecurity problems faced by the technology company.

The measure comes two months after the company revealed that data from more than 1bn user accounts had been compromised in August 2013, the largest such breach in history. The number of affected accounts was double the number implicated in a 2014 breach the internet company disclosed in September and blamed on state-sponsored hackers.