> JapanHacked_

Cyberattack and data leak statistics for Japan

Incidents disclosed in Japan, counted by prefecture, month of disclosure, and attack method or cause.

RangeRange–

Incidents by prefecture

Incidents tracked
309
Data leaked or at risk (total)113 incidents of unknown size
424M
Affected organizations listed
471
Ransomware
47
Hit through a supplier
58
Okinawa

Most incidents

  1. Tokyo 200
  2. Osaka 38
  3. Aichi 19
  4. Kanagawa 14
  5. Fukuoka 13
Incidents012–34–78–1516+By registered office and disclosure date; an incident spanning prefectures counts in each. Click to list them.

Incidents per month (disclosed) · 2026/1–2026/12

Incidents per month (disclosed)039781171562026/1: 111112026/2: 141422026/3: 121232026/4: 9942026/5: 151552026/6: 191962026/7: 101072026/8: 313182026/9: 343492026/10: 154154102026/11: 0112026/12: 012

Attack methods and causes

  • Intrusion128
  • Credential abuse54
  • Web app exploit53
  • Ransomware47
  • Misconfiguration18
  • Unknown12
  • API abuse9
  • Malware9
  • Phishing8
  • Lost device6
  • Insider5
  • Misdelivery2