Morinaga Milk: group company website breached; 18 sites of 17 companies on the same server closed
A Morinaga Milk group company’s website was accessed without authorization, and 18 sites of 17 group companies on the same server were closed. No personal data leak is confirmed.
Every organization listed paused its services as a precaution; none is listed as hit.
Disclosed
2026-11-05
Organizations involved
17
Leaked or at risk
Unknown
Downtime
Unknown
What happened
On 4 November Morinaga Milk Industry Co., Ltd. confirmed unauthorized third-party access to a group company’s website. Websites running on the same server were also closed temporarily as a precaution, covering 18 sites of 17 group companies, including Morinaga Milk Hokkaido and Tohoku Morinaga Milk. It is investigating the scope and any data loss with outside specialists; no personal data leak has been confirmed so far. No reopening date has been set. [1] [2]
Timeline
- Started, Detected 2026-11-04
- Disclosed 2026-11-05
- 1 days
Attack or cause
- Method
- [Intrusion]
- Impact
- [Service outage]
- Entry point
- Unknown
- Affected, as stated
- 17
Data exposed or at risk
–
Organizations involved
[Precautionary halt][Minor]Tokyo, ChiyodaTransport and postal services
Fr Port Co., Ltd.Its site on the shared server was closed for safety. The directly breached group company is unnamed; intrusion or leakage at each listed company is not confirmed.
[Precautionary halt][Minor]Shizuoka, NagaizumiManufacturing
Fuji Morinaga Milk Industry Co., Ltd.Its site on the shared server was closed for safety. The directly breached group company is unnamed; intrusion or leakage at each listed company is not confirmed.
[Precautionary halt][Minor]Hiroshima, Hiroshima, AsakitaManufacturing
Hiroshima Morinaga Milk Industry Co., Ltd.Its site on the shared server was closed for safety. The directly breached group company is unnamed; intrusion or leakage at each listed company is not confirmed.
[Precautionary halt][Minor]Tokyo, MinatoWholesale and retail trade
MK Foods Co., Ltd.Its site on the shared server was closed for safety. The directly breached group company is unnamed; intrusion or leakage at each listed company is not confirmed.
[Precautionary halt][Minor]Tokyo, MinatoWholesale and retail trade
Morinaga Dairy Sales Co., Ltd.Its site on the shared server was closed for safety. The directly breached group company is unnamed; intrusion or leakage at each listed company is not confirmed.
[Precautionary halt][Minor]Tokyo, MinatoManufacturing
Morinaga Engineering Co., Ltd.Its site on the shared server was closed for safety. The directly breached group company is unnamed; intrusion or leakage at each listed company is not confirmed.
[Precautionary halt][Minor]Hokkaido, Sapporo, ChuoWholesale and retail trade
Morinaga Milk Hokkaido Co., Ltd.Its site on the shared server was closed for safety. The directly breached group company is unnamed; intrusion or leakage at each listed company is not confirmed.
[Precautionary halt][Minor]Fukuoka, Fukuoka, HakataWholesale and retail trade
Morinaga Milk Kyushu Co., Ltd.Its site on the shared server was closed for safety. The directly breached group company is unnamed; intrusion or leakage at each listed company is not confirmed.
[Precautionary halt][Minor]Tokyo, MinatoWholesale and retail trade
Morinaga Milk Sales Co., Ltd.Its site on the shared server was closed for safety. The directly breached group company is unnamed; intrusion or leakage at each listed company is not confirmed.
[Precautionary halt][Minor]Tokyo, MinatoWholesale and retail trade
Morinyu Sunworld Co., Ltd.Its site on the shared server was closed for safety. The directly breached group company is unnamed; intrusion or leakage at each listed company is not confirmed.
Sources
- [1][Official]当社関係会社における不正アクセス発生に関するお知らせMorinaga Milk Industry · 2026-11-05
- [2][News]森永乳業、グループ会社サイトに不正アクセス…個人情報漏えいは確認されずThe Yomiuri Shimbun · 2026-11-05 16:15