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[Contained][Severity: Critical][Insider]

Panasonic Operational Excellence: HR data uploaded to an outside generative AI service

In an HR system project run by Panasonic Operational Excellence and its subsidiary Panasonic Digital, a project member uploaded part of the April 2026 HR system data to an outside generative AI service the company bans. It covered employee numbers, addresses, phone numbers and emails (no names) of about 75,000 employees and 178,000 former employees, and names, addresses, phone numbers and emails of about 81,000 family members registered as emergency contacts, about 334,000 people in total. It was not an outside attack. The company reported it to the Personal Information Protection Commission on September 29 and said the data was deleted and not used for training.

Disclosed

2026-10-23

Organizations involved

1

Leaked or at risk

334K

334,000

Downtime

Unknown

Timeline

  1. Disclosed 2026-10-23
  2. 1 days

Attack or cause

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

Data exposed or at risk

[Name][Postal address][Phone number][E-mail address][Employment]

Organizations involved

Open in organization search

Sources

  1. [1][Official]外部生成AIサービスへの個人情報アップロードに関するお詫びとお知らせPanasonic Operational Excellence · 2026-10-23
  2. [2][News]パナソニック、従業員が利用禁止の生成AIに個人情報をアップロードと発表 従業員ら約33万人分CNET Japan · 2026-10-23
  3. [3][News]パナソニックHD子会社、使用禁止の生成AIに従業員約33万人分の個人情報をアップロードITmedia NEWS · 2026-10-23