Yahoo issues new security warning to users

Yahoo is warning users of potentially malicious activity on their accounts between 2015 and 2016. It’s the latest development in the internet company’s investigation of a mega-breach that exposed 1 billion users’ data several years ago.
It’s not clear how many users were affected by the malicious activity, which involved the use of forged cookies – strings of data which can be used to allow people to access online accounts without re-entering their passwords.
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