Keio security incident history
Hacking, data breaches and other security incidents involving Keio, with related coverage.
Incidents: 1 · Most recent
Ransomware disrupts bookings and card payments at Japan’s Keio Group
Impact: Business system outages, disruption to hotel reservations and retail card payments, and a delay in the release of interim financial results
Japan’s Keio Group suffered a ransomware attack that disrupted its business systems. Hotel reservations and card payments at retail stores were affected. The attack also delayed the release of its interim financial results.
Related reports: 7 · last report →