Overview
“Up to 3,812” wording → count blank (553 of them received secondary phishing). Fields: email and some names.
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
- フィッシングによる社用メール不正ログインと連絡先情報の流出に関するお詫びとお知らせ株式会社講談社 · 2026-11-09