Confirmé

Osaka High Court: Teams mis-invite of about 6,000 accounts exposed usernames and emails to each other

On Aug 27, 2026 a case Teams team wrongly added ~3,500 external and ~2,500 staff accounts; invitees could see each other’s usernames/emails until same-day deletion. Court notices index dates the apology Sep 4.

Dernière mise à jour: 2026-11-09

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Présentation

“About 3,500” and “about 2,500” → blank (not summed).

Chronologie

2026-08-27Survenue
2026-08-27Découverte
2026-09-04Divulgation

Réponse de l’organisation

Per the notice, the organisation investigated and contained the incident, notified individuals and offered monitoring or protective resources.

Que faire ?

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

お知らせ（令和8年9月4日掲載）大阪高等裁判所 · 2026-11-09
大阪高等裁判所における特定の事件に係るMicrosoft Teamsのチーム作成の誤りについて（お詫び）大阪高等裁判所 · 2026-11-09

Osaka High Court: Teams mis-invite of about 6,000 accounts exposed usernames and emails to each other

Présentation

Chronologie

Réponse de l’organisation

Que faire ?

Sources

Informations associées

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