Investigating

Saitama Pref.: Shibusawa MIX admin-system intrusion may have exposed about 2,200 members’ data

Possible data leak: On Oct 6, 2026 illicit mail was sent from the Shibusawa MIX admin system. About 2,200 applicant names/emails were viewed; 3 had further details viewed; some registration data altered. Exfiltration/misuse not confirmed. Disclosed Oct 7.

Last updated: 2026-11-09

Overview

“About 2,200” → blank.

Timeline

UnknownOccurred
2026-10-06Discovered
2026-10-07Disclosed

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

渋沢MIXの管理システムへの不正アクセスについて埼玉県 · 2026-11-09

Saitama Pref.: Shibusawa MIX admin-system intrusion may have exposed about 2,200 members’ data

Overview

Timeline

Organization response

What you can do

Sources

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