Concerns have been raised that a total of 160,000 items of personal information may have been compromised at municipalities in Niigata Prefecture. The incident is believed to have stemmed from a cyberattack involving a disaster information email delivery system provided by Osaka-based IT company アルカディア.
The possibility of personal information being compromised through emergency information emails has been identified in 11 municipalities, including Mitsuke. The information at risk consists of approximately 13,000 addresses registered for Mitsuke's emergency information emails, and the municipalities are seeking measures to prevent a recurrence.
The attack is believed to have targeted a disaster information email delivery system operated by Osaka-based IT company アルカディア. It has been confirmed that municipalities nationwide used the service. According to TeNY's tally, 13 municipalities, including Niigata and Nagaoka, used the service.
Overall, approximately 160,000 items of personal information, primarily email addresses, may have been compromised, leaving municipalities and related companies working to respond. During the same period, a separate company experienced a large-scale information breach, heightening vigilance.