Four companies under MS&AD Insurance Group Holdings said on the 6th that unauthorized access to their customer-only web pages leaked a total of 720,000 customer records. No misuse of the data has been confirmed so far, they said.
At Aioi Nissay Dowa Insurance, about 444,000 records were exposed, including policy numbers, names, addresses, phone numbers and email addresses. Mitsui Sumitomo Insurance lost about 37,000 and Mitsui Sumitomo Aioi Life Insurance about 5,300, with the same categories of data.
The Aioi Nissay Dowa records also include the last four digits of credit card numbers in 3 cases, and bank names and account numbers with the last three digits removed in 19 cases.
Mitsui Direct General Insurance separately lost about 234,000 customer records to a different unauthorized access. Names and addresses were exposed, along with vehicle details and contract terms.