Japanese publisher Kadokawa has confirmed a data breach affecting 254,241 people through a cyberattack.
The finding, announced Monday, is based on a study by independent experts.
Of the leaked data, information on 186,269 individuals was related to the Kadokawa Dwango Educational Institute, including N High School, a correspondence school. Kadokawa reported the investigation results to the government’s Personal Information Protection Commission.
The leaked information also included details of all employees of Dwango Co., a division of Kadokawa that operates the video platform Niconico, as well as the names and addresses of business partners such as artists and designers.
As for the school institution, data of current students, their guardians, graduates and exam candidates were leaked, as well as contract information of Dwango’s business partners.
According to the investigation, phishing attacks led to the theft of employee account information and the breach. The stolen account information also allowed the group’s internal network to be hacked.
