Toyo University confirms alumni and parents’ email addresses leaked in external email service breach
SpilloverSpillover from the another organisation incident · View original incident →Toyo University announced on 11 November 2026 that email addresses belonging to alumni, guardians of current students and others had been leaked following a breach of the external email delivery service Arara Message. The leak resulted from unauthorised access to the service between 28 and 31 October and affected email addresses receiving the August newsletter for guardians and the October newsletter for alumni. Only email addresses were registered with the service, and the number leaked was not disclosed.
Key facts
- Affected organisation
- Toyo University
- Original incident
- Intrusion into Japanese security firm's development environment raises customer data concerns
- Incident type
- Data breach
- Occurred / detected
- 2026-10-28
- Scale of damage
- Not confirmed
- Cause / method
- Unauthorised access to an external email delivery service
- Location
- Japan
If your data was exposed
- 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
- Toyo University announced and apologised for an information leak resulting from unauthorised access to an external email delivery service.
Original incident
This is spillover from the another organisation incident.
Intrusion into Japanese security firm's development environment raises customer data concerns
Impact: Possible exposure of some customers' company names, names, email addresses and service communications information
A Japanese security services provider detected suspected third-party access to its development administration environment after an employee's GitHub credentials were compromised. It is investigating whether some customers' company names, names, email addresses and service communications information may have been viewed or obtained. The company said it would respond across the organisation to prevent a recurrence and restore trust.
Related reports: 14 · last report →
1 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.