> JapanHacked_
[Contained][Severity: Major][Intrusion]

Start dash: user account data of "Kyuun" was found on sale on an overseas site, with 39,267 users affected

On April 14 Start dash announced that it had learned of "Kyuun" user data on sale on an overseas site; its investigation found 39,267 users were affected.

Disclosed

2026-04-14

Organizations involved

1

Leaked or at risk

39.3K

39,267

Downtime

Unknown

What happened

  1. Around 18:00 it learned that user information was being sold on an overseas site. [1] [2]

  2. Its investigation showed that between April 1 and 6 third parties could access internal log-management data; it announced the leak of account data of 39,267 users. [1] [2]

Timeline

  1. Started 2026-04-01
  2. Detected 2026-04-11
  3. Disclosed 2026-04-14
  4. 13 days

Attack or cause

Method
[Intrusion]
Impact
[Data leak]
Entry point
Unknown

Data exposed or at risk

–

Organizations involved

Open in organization search

Sources

  1. [1][Official]個人情報漏えいに関するお詫びとご報告Start dash Co., Ltd. · 2026-04-14
  2. [2][News]海外サイトで販売 ～「Kyuun」で 3 万 9,267 名のユーザーのアカウント情報が漏えいした可能性ScanNetSecurity · 2026-05-07 08:05