Yahoo said Thursday an investigation had confirmed information associated with at least 500 million user accounts was stolen from the company in late 2014.
Yahoo users and others should immediately take steps to protect themselves, and stay vigilant for attempted add-on attacks in the coming days and weeks.
Yahoo also owns the photos sharing site Flickr and the blogging platform Tumblr. No Tumblr accounts were affected. However, some Flickr accounts might have been, as in some cases user’s Flickr and Yahoo IDs are linked. Yahoo is reaching out to those users.
Yahoo has 1 billion people globally who engage with one of Yahoo's properties each month.