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ColdRecon / Breach Radar / Keio Group
Breach Record

Keio Group

DISCLOSED 2026-09-26 · RANSOMWARE · RANSOMWARE

Japanese railway operator Keio suffered a ransomware attack detected on September 26, 2026, disrupting hotel reservations and payment services. The company disconnected parts of its network and is investigating with police and cybersecurity specialists. Train operations were unaffected.

The record

What we know

Disclosed
2026-09-26
Attack vector
Ransomware
Sector
Transportation
Country
Japan
RANSOMWARE
Sources

Cited reporting

↗ www.rustourismnews.com
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