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Weekly breach brief

Data breaches in the week of 7–13 September 2026

33 data breaches on the tracker, 33 confirmed by the organisation or a regulator.

Breaches
33
Notices in CA and WA
11
Ransomware claims
176
Largest
4.7M

The largest

  1. Chess.com (2026) 4,653,212 accounts
  2. Cornerstone Staffing Solutions, Inc. 366,122 people United States
  3. GI Medicine Associates, PC 264,724 people United States
  4. Greenberg Traurig, LLP (“GT”) 150,000 people United States
  5. Hibbett Retail, Inc. 109,732 people United States
  6. Midkiff, Muncie & Ross P.C 26,097 people United States

Every breach this week, by country

United States 32

Country being checked 1

Ransomware claims

Gangs named 176 organisations on their leak sites this week, against 204 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 · Found a mistake? Tell us and we correct it.