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Data breach

Keisei reservation system breach may expose 3.37 million customer records

First reported · Last reported · 15 related reports

Unauthorized access to Keisei Electric Railway’s Skyliner seat reservation system on November 11, 2026, raised concerns that up to approximately 3.37 million customer records may have been exposed. The information includes user IDs, encrypted passwords, names, phone numbers, and email addresses. The company has suspended online reservations and is investigating the scope of the breach, with no timetable for resuming the service as of November 14.

Key facts

Affected organization
Keisei Electric Railway
Incident type
Data breach
Occurred / detected
2026-11-11
Scale of damage
Possible exposure of up to approximately 3.37 million customer records
Cause / method
Unauthorized access to the Skyliner seat reservation system
Location
Japan

If your data was exposed

Exposed dataNamePhone numberEmailUsernamePassword

  1. Change your password, and also change it on any other site where you use the same one. Turn on two-factor authentication if available.
  2. Don’t tap links in texts, calls or emails that mention this incident and offer compensation, refunds or breach checks. Check directly on the organization’s official website or app.

Timeline

  1. Unauthorized access occurred in the Skyliner seat reservation system.
  2. The possible exposure of up to approximately 3.37 million customer records became known, and an investigation into the scope of the breach proceeded while online reservations remained suspended.

15 related reports

The summary and key facts are written by AI from related reports and may contain errors. Check the original articles and the organization’s official statements for accurate details.