Toyota Motor said on Friday that data of more than 2 million users of its internet-connected car services in Japan had been left accessible for nearly a decade.
The Japanese automaker says the data included vehicle location and car identification numbers of users of T-Connect and other connected car services.
Toyota blames erroneous cloud storage settings for the problem. It says about 2.15 million users who signed up from January 2012 to April this year were affected. Their data were accessible from November 2013.
Toyota says no data leak or damage has been confirmed, adding that the type of information involved will not be enough to identify individuals even if leaked.
The company's connected car services allow the conditions of registered vehicles to be checked remotely and trigger emergency calls if necessary.
Toyota apologized for causing any trouble and concern, and said it will strengthen employee training to prevent a recurrence.