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Data breach

Yomiuri Giants fan club leak exposes 807,030 email addresses

First reported · Last reported · 11 related reports

On 12 November, the membership information management system for CLUB GIANTS, the Yomiuri Giants' official fan club, came under attack for around six hours, exposing 807,030 email addresses. The club discovered the incident following insufficient server capacity and access problems and is investigating whether other membership information was leaked. The system held no credit card information, and no misuse was reported.

Key facts

Affected organisation
Yomiuri Giants
Incident type
Data breach
Occurred / detected
2026-11-12
Scale of damage
807,030 fan club member email addresses
Cause / method
A cyber-attack on the fan club's membership information management system
Location
Japan

If your data was exposed

Exposed dataEmail

  1. Don’t tap links in texts, calls or emails that mention this incident and offer compensation, refunds or breach checks. Check directly on the organisation’s official website or app.

Timeline

  1. The fan club's membership information management system came under attack from 3am to 9am.
  2. The leak of 807,030 email addresses was disclosed, and an investigation was under way into whether other membership information had also been leaked.
  3. It was reported that the club held no credit card information in the system and that no misuse had been reported.

11 related reports

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