Mitsui Sumitomo: MS Compass breach exposes about 23,000 customer records

Unauthorized access detected on 2–3 November exposed about 23,000 records for members, seminar applicants and inquiry-form users. Fields include company names/numbers, positions, personal names, email, phones, industry, office addresses, revenue and employee counts. The November 2023–November 2026 period applies to seminar applications; the notice does not assign it to every category. Cards and bank accounts are excluded; misuse is not confirmed. [1]

Access to part of the system was restricted on 3 November and the entire site temporarily closed on the 6th. No unauthorized access is reported after the 3rd. External specialists are investigating cause and scope, with individual notification planned. No common attack with the policyholder-page or PCS incidents is established, so their counts are not combined. [1]