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

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

  1. Started 2025-08-26
  2. Detected 2025-08-29
  3. Disclosed 2025-11-28
  4. 94 days

Attack or cause

Method
[Intrusion]
Impact
[Data leak]
Entry point
Remote access

Data exposed or at risk

[Name][E-mail address][Passwords][Employment]

Organizations involved

Open in organization search

Sources

  1. [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