TOPPAN: Sompo Japan policyholder data sent to another insurer

On 1 September, while manually sending lists for the insurance premium deduction certificate service it runs for non-life insurers, a TOPPAN operator made a drag-and-drop mistake and put a ZIP file with Sompo Japan policyholder data inside a file sent to another insurer. Kana names, deduction policy numbers and job IDs of 177,426 people were included, and the contents were not checked before sending. The recipient deleted the data, and no further leak was found.