Large-scale incident Any 2026-11-09 Sapporo City: Eki Bus Navi breach sends false transit alerts; information services suspended (2) 2026-11-05 SMBC Consumer Finance: guarantee system breach leaks income and licence numbers of up to 320,000 people (17) 2026-11-02 Prestige Core Solution: up to about 5.5 million records stolen, including three full card numbers (12) 2026-10-30 Securitize Japan: platform breach leaks investor data, including up to 9,086 Marui applicants (3) 2026-10-29 Arara: 81,329,467 email addresses leaked or at risk, affecting up to about 380 clients (254) 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 (8) 2026-10-16 Studio: website builder cloud intrusion puts company and public-sector form submissions at risk (16) 2026-10-13 Arcadia: SpeeCAN RAIDEN intrusion disrupts safety alerts and puts registration data at risk (7) 2026-10-08 Commune: Commune intrusion (9) 2026-10-07 IDC Frontier: ransomware attack on IDCF Cloud (6) 2026-09-09 ApplyNow: unauthorized access to its recruiting platform (3) 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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