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Confirmed

COO: Meruhaikun intrusion leaked 2,255 customer email addresses

Forensic work on Delightful’s Meruhaikun intrusion confirmed 2,255 of COO’s newsletter emails were in the leaked set; disclosed Aug 27, 2026. Vendor root to be linked later.

Last updated: 2026-11-09

Overview

2,255 records.

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. 【重要】外部メール配信システムへの不正アクセスによる個人情報漏えいに関するお詫びとお知らせ株式会社クー · 2026-11-09

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