Earlier this year in late April, Nintendo admitted that up to 160,000 Nintendo accounts had been breached in a hack. Today on June 9, the company released an update stating that far more accounts than this initial figure had actually been accessed back in April.
In an update on the support section of the Japanese Nintendo website, the company revealed that an additional 140,000 accounts could have potentially been breached. This would bring the total up to right around 300,000, when coupled with the initial 160,000 figure from a few months ago (thanks, VideoGamesChronicle).
In the initial breach in April, Nintendo reported that personal details like nickname, date of birth, and email address may have been revealed through accounts that were hacked. At the time, this came off the back of many Nintendo Switch users reported having had their accounts accessed and items on the eShop purchased without their consent.
When Nintendo acknowledged the original breach, they immediately discontinued the ability to sign in to a Nintendo user account with a Nintendo Network ID. Additionally, the company also urged all users to set up two-factor authentication on their Nintendo accounts, whether they'd been hit by the breach or not. Nintendo has reportedly been in the process of refunding those who have had their accounts hacked and money spent on unauthorized purchases.
Right now, there's no further word from Nintendo on additional steps for those affected to take. We'll update this post should Nintendo release any new information.