Hokkaido Electric Power security incident history
Hacking, data breaches and other security incidents involving Hokkaido Electric Power, with related coverage.
Incidents: 1 · Most recent
Hokkaido Electric Power reports 5,664 email addresses leaked in October Arara cyber-attack
↳ Knock-on damage from the Arara incident · View original incident5.7kImpact: 5,664 email addresses
Hokkaido Electric Power announced on 13 November that unauthorised access to the external email delivery service “Arara Message” between 27 and 31 October 2026 had exposed 5,664 customer email addresses from its e-commerce site “Kirameku Store”. Names, addresses, telephone numbers, passwords and credit card information were not exposed. The company disconnected its site from the service and advised customers to watch out for suspicious emails.
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