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Data breach

About 1.011 million customer records exposed at MS&AD insurers

First reported · Last reported · 14 related reports

Unauthorised access to policyholder systems at insurers in Japan’s MS&AD group and to external contractors led to the exposure of customer information. Following disclosures by group companies on 6 November, Mitsui Sumitomo Insurance and Mitsui Direct General Insurance announced approximately 296,000 additional exposed records on 9 November, bringing the group’s cumulative total to about 1.011 million. The exposed information included names, addresses and telephone numbers, as well as the last four digits of card numbers and bank account information for some customers.

Key facts

Affected organisation
MS&AD Insurance Group Holdings
Incident type
Data breach
Occurred / detected
Not confirmed
Scale of damage
Approximately 1.011 million customer records
Cause / method
Unauthorised access to policyholder systems at group insurers and external contractors handling roadside assistance, among others
Location
Japan

If your data was exposed

Exposed dataNamePhone numberAddressCard detailsBank account

  1. Don’t tap links in texts, calls or emails that mention this incident and offer compensation, refunds or breach checks. Check directly on the organisation’s official website or app.
  2. Turn on payment alerts in your card issuer’s app, and if you see a charge you don’t recognise, ask the issuer to block and reissue the card.

Timeline

  1. MS&AD group insurers announced that unauthorised access had exposed insurance policy information and customers’ personal information.
  2. Mitsui Sumitomo Insurance and Mitsui Direct General Insurance announced approximately 296,000 additional exposed records, bringing the group’s cumulative total to about 1.011 million.

14 related reports

The summary and key facts are written by AI from related reports and may contain errors. Check the original articles and the organisation’s official statements for accurate details.