Daiichi Life Group: unauthorized access to the HR system
On 24 September, Daiichi Life Group and Daiichi Life Insurance detected unauthorized access to the HR system both companies use. Employee numbers, names, addresses, phone numbers, genders, departments, positions and managers' names of about 120,000 people (about 50,000 employees and about 70,000 former employees) may have been viewed and taken, including staff seconded to group companies. No access to customer data was found.
Disclosed
2026-10-02
Organizations involved
2
Leaked or at risk
120K
120,000
Downtime
Unknown
Timeline
- Detected 2026-09-24
- Disclosed 2026-10-02
- 8 days
Attack or cause
- Method
- [Intrusion]
- Impact
- [Data leak]
- Entry point
- Unknown
Data exposed or at risk
Organizations involved
[Breached][Critical]Tokyo, ChiyodaFinance and insurance120,000 leaked
Daiichi Life Group, Inc.[Breached][Critical]Tokyo, ChiyodaFinance and insurance
Daiichi Life Insurance Co., Ltd.
Sources
- [1][Official]退職された皆さまへのお知らせ 当社の従業員向け人事システムへの不正アクセスについてDai-ichi Life Group and Dai-ichi Life Insurance · 2026-10-02
- [2][News]第一ライフグループ、従業員の個人情報流出か 退職者含む12万人分Nikkei · 2026-10-02