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Weekly breach brief

Data breaches in the week of 22–28 June 2026

56 data breaches on the tracker, 56 confirmed by the organisation or a regulator.

Breaches
56
Notices in CA and WA
17
Ransomware claims
112
Largest
9.8M

The largest

  1. Madison Square Garden Sports 9,796,738 accounts
  2. Medtronic Inc. 3,834,294 people United States
  3. Glendale Community College 793,925 accounts
  4. Inter-Con Security 276,114 accounts United States
  5. Tower Administrative Services, Inc. 248,940 people United States
  6. American Tower 216,601 accounts

Every breach this week, by country

United States 53

Country being checked 3

Ransomware claims

Gangs named 112 organisations on their leak sites this week, against 211 the week before. A claim is the gang’s word, not a confirmed breach.

Every week

Follow the brief: one entry a week (Atom). The 2026 report has the year so far.

From the data breach tracker: official notices, breach databases and the news, every fact with its source. Open data (CC BY 4.0) · How the tracker works · Official registers · Corrections and changes · Found a mistake? Tell us and we correct it.