Confirmed

Osaka Kyoiku University: 2,376 student email addresses leaked via misaddressed bulk mail

On January 14 and 21, 2026, bulk student emails used To instead of Bcc so addresses were visible to others; the university disclosed this on February 2.

Last updated: 2026-11-09

Overview

2,376 email addresses in total. Affected students were apologised to on January 29 and asked to delete the mail. No misuse confirmed.

Timeline

  1. Occurred
  2. Discovered
  3. 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

  1. メールアドレスの漏えいについて国立大学法人大阪教育大学 · 2026-11-09

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