Présentation
The event occurred and was detected on February 10. Potentially accessible data included member names, dates of birth, contacts, addresses, last four card digits/expiry and password hashes, plus some Yahoo! Auctions buyers, employees and warehouse-contractor staff information. No aggregate count is published, so it remains NULL. Service-market countries are not treated as affected countries.
Chronologie
- Survenue
- Découverte
- Divulgation
Initial notice of possible data exposure.
Investigation results and affected categories published.
Service resumed with password-reset instructions.
Réponse de l’organisation
Following investigation, containment and remediation, Sekaimon resumed on April 23 with password-reset guidance; its Yahoo! Auctions shop remained suspended.
Que faire ?
Check notices through the organisation’s genuine contact channels. Do not enter credentials or payment details through links in unexpected messages.
Sources
- セカイモンの調査結果と対象情報BEENOS · 2026-11-09
- セカイモンのサービス再開BEENOS · 2026-11-09
- セカイモンへの不正アクセスに関するお知らせBEENOS · 2026-11-09