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[Investigating][Severity: Major][Unknown]

Takarakuji: members' passwords were changed without their action, and the official site is stopped

Members' passwords on the official site were changed without their action, so the site was stopped. A possible leak of names and payment details is under investigation.

Disclosed

2026-11-05

Organizations involved

1

Leaked or at risk

Unknown

Downtime

Unknown

What happened

  1. On Takarakuji official site, members' passwords were found to have been changed without their intent. According to TV Asahi, use of the site has been stopped since about 10:00. [1] [3]

Impact

National Council for Local Government Lotteries is investigating the scope and will contact the affected members once it is known. The cause and the number of members affected have not been disclosed. [1] [2]

According to TV Asahi, member records hold names, payment details and other information, and a possible leak is being investigated. [3]

Members who use the same ID and password on other services are asked to consider changing them. Purchases and campaign entries on the site are unavailable, but lottery shops are open as usual. [1]

Timeline

  1. Disclosed 2026-11-05
  2. 1 days

Attack or cause

Method
[Unknown]
Impact
[Service outage]
Entry point
Unknown

Data exposed or at risk

–

Services hit

Organizations involved

Sources

  1. [1][Official]【宝くじ公式サイト】（利用一時停止のお知らせ）National Council for Local Government Lotteries · 2026-11-05
  2. [2][News]宝くじサイト 利用者パスワード意図せず変更される 一時停止にNHK · 2026-11-05 18:09
  3. [3][News]宝くじサイト 勝手にパスワード変更される 公式サイトの利用を一時停止TV Asahi · 2026-11-05 19:01