Shinagawa child care program exposes 195 email addresses in subcontractor breach
SpilloverSpillover from the another organization incident · View original incident →User email addresses were leaked following unauthorized access, confirmed on October 28, 2026, at arara, the email delivery subcontractor for School Mail, which is used by Shinagawa City's morning child care program. The city said that, as of 5 p.m. on November 10, 195 email addresses had been exposed, affecting users who registered with or logged in to School Mail between June 30 and October 28. Only email addresses were leaked, and there was no unauthorized access to School Mail itself.
Key facts
- Affected organization
- Shinagawa City
- 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
- 195 email addresses leaked
- Cause / method
- Unauthorized access to an 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 organization’s official website or app.
Timeline
- Shinagawa City announced a data leak resulting from a breach of the email delivery service used by its program for children.
Original incident
This is spillover from the another organization 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 organization to prevent 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 organization’s official statements for accurate details.