According to a statement published by the government of Japan’s third-largest city, hackers accessed the Arara email distribution service used by TKC Corporation, the company contracted to maintain the administrative services platform. Anyone who received an email from the system run by the city between July 2026 and October 31 had their email address leaked, according to the city. They warned the city’s 2.8 million residents to be wary of suspicious emails purporting to come from the city — urging everyone not to open any URLs or attachments. The city breach came days after the regional government of the Osaka Prefecture announced its own data breach involving the information of food support program participants.
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City of Osaka warns of data breach impacting 1 million as Japan reels from dozens of cyber incidents
The city of Osaka notified the public that a data breach involving a third-party technology provider exposed more than 1 million email addresses tied to an online administrative services platform.
Reported by therecord.media.
