Overview
12,211 addresses were registered by November 4, but the city says whether and how many actually leaked is still under investigation, so the count field is left blank. No other fields reportedly at risk. No intrusion into the reservation system itself. This stems from the Arara email-platform intrusion (recorded separately); the registration pool is a subset of the vendor scope and must not be added to it.
Timeline
- Occurred
- Discovered
- Disclosed
Organization response
Per the notice, the organisation investigated and contained the incident, notified individuals and offered monitoring or protective resources.
What you can do
Be wary of emails, SMS or calls impersonating the organisation; do not open links or attachments or enter passwords or card details. Change reused passwords on other services.
Sources
- メール配信サービスに対する不正アクセスによる個人情報漏えいの可能性について仙台市 · 2026-11-09