Mitsui Sumitomo Insurance: several employees seconded to Toyota Motor leaked information held by Toyota
On April 24 Mitsui Sumitomo Insurance announced that several of its employees seconded to Toyota Motor had leaked information held by Toyota.
Disclosed
2026-04-24
Organizations involved
2
Leaked or at risk
Unknown
Downtime
Unknown
What happened
It announced that it had confirmed cases, including suspected ones, in which several employees seconded from it to Toyota Motor leaked information held by Toyota. [1] [2]
Timeline
- Disclosed 2026-04-24
- 1 days
Attack or cause
- Method
- [Insider]
- Impact
- [Data leak]
- Entry point
- Unknown
Data exposed or at risk
–
Organizations involved
[Breached][Moderate]Tokyo, ChiyodaFinance and insurance
Mitsui Sumitomo Insurance Company, LimitedSeveral seconded employees leaked information from the company they were seconded to.
[Breached][Moderate]Aichi, ToyotaManufacturing
Toyota Motor CorporationInformation it held was leaked by employees seconded from the insurer.
Sources
- [1][Official]当社出向者による情報漏えい事案についてMitsui Sumitomo Insurance Co., Ltd. · 2026-04-24
- [2][News]三井住友海上火災保険の出向者、トヨタ自動車の保有する情報を漏えいScanNetSecurity · 2026-04-27 08:05