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26-0623
File

Third-party Flaw Exposed 14.2 Million Mailboxes at KDDI and Five Other ISPs

A third-party software flaw reached email accounts across six Japanese providers. Choosing a different ISP bought no independence.

UnattributedThird-party softwareTelecomThird party
Sev 3TargetKDDI and five other ISPsActorUnattributedJapan
26-0213
File

Japanese Hotel Chain Ransomware Hit Business Systems but Not Membership Server

Business systems encrypted; the segmented membership server untouched. Our database is mostly a record of controls that failed.

UnattributedRansomwareRetailHospitality
Sev 2TargetWashington Hotel chain (JP)ActorUnattributedJapan
26-0210
File

NetRunner Demanded $100 Million From Nippon Medical School Hospital

A reported $100 million demand against a Japanese teaching hospital, and about 131,700 people. Only one of those numbers means anything.

NetRunnerRansomwareHealthcareHealthcare
Sev 4TargetNippon Medical School Musashi KosugiActorNetRunnerJapan
25-0619
File

Japan Recorded 71 Hacktivist Incidents From a Single Source in 2025

A defaced page and a five-week production halt appear identically in an incident tally.

UnattributedHacktivismMultipleInternational
Sev 2TargetJapanese organisationsActorUnattributedJapan
23-0111
File

Zurich and Aflac Japan Lost 2.08 Million Customers’ Data Through the Same Kind of Contractor

Two insurers, one week, one kind of contractor, and 2.08 million customers. Neither company named the vendor or confirmed it was shared.

UnattributedContractor file transfer serverInsuranceThird party
Sev 3TargetZurich Insurance Japan and Aflac Japan customersActorUnattributedJapan
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