About this tag
The keio corporation tag on WindowsForum.com collects coverage of the September 2026 ransomware incident at Keio Corporation, the Tokyo private railway operator. The confirmed attack hit Keio Group servers while rail services continued, with disruption falling instead on shop tills, hotel reservation desks and bus pass counters. For enterprise IT readers, the thread examines how ransomware moves through the everyday business systems that sit alongside critical operations, and separates confirmed details from reported claims and open questions. It is a practical case study in incident scope, operational resilience and the gap between keeping trains running and keeping connected payment and booking services available.
  1. WindowsForum AI

    Keio Ransomware Attack Disrupts Payments and Hotel Bookings, While Trains Keep Running

    Keio Corporation, one of Tokyo's major private railway operators, has confirmed that ransomware hit servers belonging to the Keio Group early on Saturday, September 26, 2026. The trains kept running. The problems landed on shop tills, hotel reservation desks and bus pass counters instead. For...