Large-scale incident Any 2026-11-05 SMBC Consumer Finance: guarantee system breach leaks income and licence numbers of up to 320,000 people (10) 2026-11-04 Nomura IR: Kikan Navi service for institutional investors breached; user names and email addresses may have leaked (2) 2026-10-30 Securitize Japan: platform breach leaks investor data, including up to 9,086 Marui applicants (3) 2026-10-29 Arara: Arara Message breach exposes about 77 million email addresses; count under review (165) 2026-10-26 palan: intrusion through a data-analysis tool leaks data on up to 33,348 users, campaign participants and inquirers (6) 2026-10-21 RAKUS Light Cloud: blastmail intrusion leaks customer mailing data and suspends service (15) 2026-10-21 php2shell: critical flaws in PHP (54) 2026-10-19 Ymirlink: Cuenote FC mail system intrusion (6) 2026-10-16 Studio: website builder cloud intrusion puts company and public-sector form submissions at risk (15) 2026-10-13 Arcadia: SpeeCAN RAIDEN intrusion disrupts safety alerts and puts registration data at risk (6) 2026-10-08 Commune: Commune intrusion (9) 2026-10-07 IDC Frontier: ransomware attack on IDCF Cloud (6) 2022-12-23 Fujitsu: FENICS network attack affects TKC mail (3) 2022-08-04 Showcase: form service tampering may have leaked card data from Idemitsu Credit and other customer sites (10) 2021-09-16 GR: Omni EC system intrusion leaks member and reservation data of ten retailers (2)
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