The leaked information included names, business titles and affiliations of the participants belonging to about 90 organizations, including the organizing body of the Olympics and Paralympics, ministries, local governments hosting venues such as Tokyo and Fukushima Prefecture, and sponsors of the games.
Takahito Tokita, the president of Fujitsu which is also contracted to oversee clients’ computer systems, apologized the same day to Olympic minister Tamayo Marukawa for the data breach.
Fujitsu said in late May that the data of several of its corporate clients had been compromised due to unauthorized access to the tool, which is used to share information between internal and external parties of a company.
The leak was likely due to a malware infection, the sources said, but the company is still investigating the cause and the extent of the impact.
The government agencies including the foreign and transport ministries have said at least 76,000 email addresses of government officials and external parties, such as members of panels, as well as study materials on creating a digital government, were breached.