Mitsubishi Paper Mills: intrusion through remote access
Unauthorized remote connections on August 26–28 were identified on August 29. Isolation and investigation identified confirmed or possible exposure concerning 2,422 current staff/officers and 1,787 former staff. Names, business email and encrypted passwords were among the fields. Customer, bank and My Number information was excluded; no operational or secondary harm was confirmed.
Disclosed
2025-11-28
Organizations involved
1
Leaked or at risk
2.4K
2,422
Downtime
Unknown
Timeline
- Started 2025-08-26
- Detected 2025-08-29
- Disclosed 2025-11-28
- 94 days
Attack or cause
- Method
- [Intrusion]
- Impact
- [Data leak]
- Entry point
- Remote access
Data exposed or at risk
Organizations involved
[Breached][Critical]Tokyo, SumidaManufacturing2,422 leaked
Mitsubishi Paper Mills Limited
Sources
- [1][Official]不正アクセスによる情報漏えい及びそのおそれに関するお詫びとお知らせMitsubishi Paper Mills Limited · 2025-11-28