Privacy Unpacked- Status
- Confirmed breach
- People affected
- 8,000,000 customers
- Reported
- 12 October 2026
What was exposed
- Personal data
How it happened
- How
- Other
supply chain breach
source
Confirmed breach
Daiichi Kosho data breach
JPJapan
Infosecurity Magazine reported a data breach at Daiichi Kosho (Japan) on 12 October 2026, and it has been confirmed. It affected 8,000,000 customers. Exposed: Personal data.
If Daiichi Kosho had your data
- Look for Daiichi Kosho’s own notice or letter: it should say what of yours was involved. Keep it.
- Expect scams that use your details: calls, texts or emails pretending to be Daiichi Kosho, your bank or the police. Never give codes or passwords, never approve a sign-in you did not start, never move money.
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- Sony Network Communications Financial account and card detailsPasswords and loginsEmail addresses+3 2.6Mcustomer records
- Joshin Passwords and loginsPhone numbersNames+6 6.2Mrecords
- JR East Email addressesNames 170Krecords
- Rakuten Travel Financial account and card details 2.6Mcustomers
From the data breach tracker: official notices, breach databases and the news, every fact with its source. Open data (CC BY 4.0) · How the tracker works · Found a mistake? Tell us and we correct it.