Naha confirms 15,700 email addresses leaked in external email service hack
SpilloverSpillover from the Arara incident · View original incident →The Japanese city of Naha said 15,700 user email addresses had been exposed through unauthorized access to Arara Message, an external email delivery service used by its online application system. This was a follow-up announcement on the incident in which unauthorized access was confirmed on October 31, 2026. It was confirmed that no other information, including email bodies, My Number identification numbers or application information, had been exposed.
Key facts
- Affected organization
- City of Naha
- Original incident
- Arara email service hack exposes 81.33 million email addresses
- Incident type
- Data breach
- Occurred / detected
- 2026-10-31
- Scale of damage
- 15,700 user email addresses
- Cause / method
- Unauthorized access
- Location
- Japan
If your data was exposed
Exposed dataEmail
- 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
- It emerged that 15,700 user email addresses had been exposed in Naha through unauthorized access.
Original incident
This is spillover from the Arara incident.
Arara email service hack exposes 81.33 million email addresses
81.3MImpact: 81,329,467 email addresses and some customers' member information
Japan's Arara Message email delivery service was breached through a web server vulnerability, exposing email addresses and some customers' member information. Further investigation put the number of unique email addresses exposed at 81,329,467. The attacker also abused the service to send up to approximately 7.13 million emails impersonating credit card companies, and the company isolated the servers and completely suspended its email delivery service.
Related reports: 20 · 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.