{
 "generated_at": "2026-11-04T00:00:00+09:00",
 "coverage_from": "2026-10",
 "note": "構造化済みの事案を、初報の公表月で数えたもの。over_100k / over_1m は公表された影響件数（最大値）が 10 万件・100 万件以上の事案数。委託先と利用企業が別々に公表するため、件数の合計は重複が大きく出していない。",
 "license": "CC BY 4.0",
 "source": "https://breachcheckjp.com/stats/",
 "months": [
  {
   "n": 1,
   "confirmed": 0,
   "official": 1,
   "listed": 1,
   "via_vendor": 0,
   "high_risk": 1,
   "password": 1,
   "card": 0,
   "affected_known": 1,
   "over_100k": 1,
   "over_1m": 0,
   "causes": {
    "unauthorized_access": 1
   },
   "sectors": {
    "その他": 1
   },
   "month": "2025-05",
   "complete_coverage": false,
   "in_progress": false
  },
  {
   "n": 1,
   "confirmed": 0,
   "official": 1,
   "listed": 0,
   "via_vendor": 0,
   "high_risk": 1,
   "password": 0,
   "card": 0,
   "affected_known": 1,
   "over_100k": 1,
   "over_1m": 0,
   "causes": {
    "unauthorized_access": 1
   },
   "sectors": {
    "金融": 1
   },
   "month": "2025-07",
   "complete_coverage": false,
   "in_progress": false
  },
  {
   "n": 1,
   "confirmed": 0,
   "official": 1,
   "listed": 0,
   "via_vendor": 0,
   "high_risk": 0,
   "password": 0,
   "card": 0,
   "affected_known": 0,
   "over_100k": 0,
   "over_1m": 0,
   "causes": {
    "unauthorized_access": 1
   },
   "sectors": {
    "その他": 1
   },
   "month": "2025-09",
   "complete_coverage": false,
   "in_progress": false
  },
  {
   "n": 2,
   "confirmed": 2,
   "official": 2,
   "listed": 1,
   "via_vendor": 1,
   "high_risk": 0,
   "password": 0,
   "card": 0,
   "affected_known": 1,
   "over_100k": 0,
   "over_1m": 0,
   "causes": {
    "unauthorized_access": 1,
    "other": 1
   },
   "sectors": {
    "医療": 1,
    "その他": 1
   },
   "month": "2025-11",
   "complete_coverage": false,
   "in_progress": false
  },
  {
   "n": 9,
   "confirmed": 2,
   "official": 7,
   "listed": 2,
   "via_vendor": 1,
   "high_risk": 1,
   "password": 0,
   "card": 0,
   "affected_known": 7,
   "over_100k": 1,
   "over_1m": 0,
   "causes": {
    "unauthorized_access": 6,
    "vendor_breach": 1,
    "misconfiguration": 1,
    "ransomware": 1
   },
   "sectors": {
    "製造": 5,
    "医療": 2,
    "教育": 1,
    "その他": 1
   },
   "month": "2025-12",
   "complete_coverage": false,
   "in_progress": false
  },
  {
   "n": 7,
   "confirmed": 2,
   "official": 6,
   "listed": 1,
   "via_vendor": 0,
   "high_risk": 3,
   "password": 1,
   "card": 1,
   "affected_known": 4,
   "over_100k": 1,
   "over_1m": 0,
   "causes": {
    "unauthorized_access": 6,
    "ransomware": 1
   },
   "sectors": {
    "通信": 1,
    "不動産": 1,
    "医療": 1,
    "小売": 1,
    "その他": 3
   },
   "month": "2026-01",
   "complete_coverage": false,
   "in_progress": false
  },
  {
   "n": 12,
   "confirmed": 4,
   "official": 11,
   "listed": 6,
   "via_vendor": 0,
   "high_risk": 3,
   "password": 2,
   "card": 0,
   "affected_known": 8,
   "over_100k": 2,
   "over_1m": 0,
   "causes": {
    "unauthorized_access": 7,
    "ransomware": 3,
    "mis_send": 1,
    "misconfiguration": 1
   },
   "sectors": {
    "小売": 4,
    "製造": 2,
    "医療": 1,
    "不動産": 1,
    "その他": 4
   },
   "month": "2026-02",
   "complete_coverage": false,
   "in_progress": false
  },
  {
   "n": 12,
   "confirmed": 6,
   "official": 9,
   "listed": 2,
   "via_vendor": 6,
   "high_risk": 1,
   "password": 0,
   "card": 0,
   "affected_known": 6,
   "over_100k": 1,
   "over_1m": 0,
   "causes": {
    "unauthorized_access": 5,
    "vendor_breach": 3,
    "misconfiguration": 2,
    "ransomware": 1,
    "mis_send": 1
   },
   "sectors": {
    "不動産": 2,
    "製造": 1,
    "教育": 1,
    "行政": 1,
    "その他": 7
   },
   "month": "2026-03",
   "complete_coverage": false,
   "in_progress": false
  },
  {
   "n": 14,
   "confirmed": 7,
   "official": 10,
   "listed": 2,
   "via_vendor": 4,
   "high_risk": 2,
   "password": 1,
   "card": 0,
   "affected_known": 9,
   "over_100k": 4,
   "over_1m": 1,
   "causes": {
    "unauthorized_access": 7,
    "vendor_breach": 3,
    "ransomware": 2,
    "misconfiguration": 1,
    "other": 1
   },
   "sectors": {
    "金融": 3,
    "小売": 2,
    "不動産": 2,
    "通信": 1,
    "行政": 1,
    "医療": 1,
    "その他": 4
   },
   "month": "2026-04",
   "complete_coverage": false,
   "in_progress": false
  },
  {
   "n": 8,
   "confirmed": 2,
   "official": 7,
   "listed": 2,
   "via_vendor": 3,
   "high_risk": 2,
   "password": 2,
   "card": 0,
   "affected_known": 3,
   "over_100k": 0,
   "over_1m": 0,
   "causes": {
    "unauthorized_access": 5,
    "vendor_breach": 2,
    "ransomware": 1
   },
   "sectors": {
    "不動産": 1,
    "金融": 1,
    "製造": 1,
    "その他": 5
   },
   "month": "2026-05",
   "complete_coverage": false,
   "in_progress": false
  },
  {
   "n": 11,
   "confirmed": 2,
   "official": 9,
   "listed": 1,
   "via_vendor": 1,
   "high_risk": 4,
   "password": 2,
   "card": 0,
   "affected_known": 8,
   "over_100k": 4,
   "over_1m": 3,
   "causes": {
    "unauthorized_access": 6,
    "misconfiguration": 2,
    "ransomware": 2,
    "lost_device": 1
   },
   "sectors": {
    "通信": 3,
    "小売": 2,
    "製造": 1,
    "その他": 5
   },
   "month": "2026-06",
   "complete_coverage": false,
   "in_progress": false
  },
  {
   "n": 25,
   "confirmed": 15,
   "official": 18,
   "listed": 4,
   "via_vendor": 8,
   "high_risk": 9,
   "password": 7,
   "card": 2,
   "affected_known": 22,
   "over_100k": 9,
   "over_1m": 6,
   "causes": {
    "unauthorized_access": 12,
    "vendor_breach": 6,
    "other": 2,
    "ransomware": 2,
    "misconfiguration": 2,
    "mis_send": 1
   },
   "sectors": {
    "通信": 8,
    "小売": 6,
    "製造": 2,
    "金融": 2,
    "医療": 1,
    "その他": 6
   },
   "month": "2026-07",
   "complete_coverage": false,
   "in_progress": false
  },
  {
   "n": 37,
   "confirmed": 15,
   "official": 34,
   "listed": 9,
   "via_vendor": 2,
   "high_risk": 11,
   "password": 6,
   "card": 5,
   "affected_known": 24,
   "over_100k": 10,
   "over_1m": 5,
   "causes": {
    "unauthorized_access": 29,
    "ransomware": 4,
    "misconfiguration": 3,
    "vendor_breach": 1
   },
   "sectors": {
    "小売": 12,
    "通信": 2,
    "製造": 2,
    "不動産": 2,
    "医療": 1,
    "金融": 1,
    "行政": 1,
    "飲食": 1,
    "その他": 15
   },
   "month": "2026-08",
   "complete_coverage": false,
   "in_progress": false
  },
  {
   "n": 48,
   "confirmed": 21,
   "official": 35,
   "listed": 14,
   "via_vendor": 6,
   "high_risk": 10,
   "password": 6,
   "card": 2,
   "affected_known": 37,
   "over_100k": 12,
   "over_1m": 7,
   "causes": {
    "unauthorized_access": 31,
    "misconfiguration": 5,
    "mis_send": 4,
    "lost_device": 4,
    "vendor_breach": 3,
    "ransomware": 1
   },
   "sectors": {
    "行政": 6,
    "小売": 4,
    "教育": 4,
    "製造": 2,
    "金融": 2,
    "不動産": 1,
    "通信": 1,
    "飲食": 1,
    "医療": 1,
    "その他": 26
   },
   "month": "2026-09",
   "complete_coverage": false,
   "in_progress": false
  },
  {
   "n": 332,
   "confirmed": 135,
   "official": 315,
   "listed": 97,
   "via_vendor": 165,
   "high_risk": 61,
   "password": 42,
   "card": 5,
   "affected_known": 222,
   "over_100k": 62,
   "over_1m": 32,
   "causes": {
    "vendor_breach": 158,
    "unauthorized_access": 149,
    "misconfiguration": 10,
    "ransomware": 4,
    "other": 4,
    "mis_send": 4,
    "lost_device": 3
   },
   "sectors": {
    "小売": 55,
    "行政": 35,
    "金融": 29,
    "通信": 20,
    "教育": 20,
    "飲食": 12,
    "医療": 12,
    "製造": 11,
    "不動産": 5,
    "その他": 133
   },
   "month": "2026-10",
   "complete_coverage": true,
   "in_progress": false
  },
  {
   "n": 34,
   "confirmed": 21,
   "official": 34,
   "listed": 11,
   "via_vendor": 25,
   "high_risk": 5,
   "password": 3,
   "card": 0,
   "affected_known": 24,
   "over_100k": 12,
   "over_1m": 6,
   "causes": {
    "vendor_breach": 25,
    "unauthorized_access": 8,
    "other": 1
   },
   "sectors": {
    "小売": 8,
    "行政": 4,
    "金融": 2,
    "飲食": 1,
    "その他": 19
   },
   "month": "2026-11",
   "complete_coverage": true,
   "in_progress": true
  }
 ]
}