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Weekly breach brief

Data breaches in the week of 25–31 May 2026

54 data breaches on the tracker, 54 confirmed by the organisation or a regulator.

Breaches
54
Notices in CA and WA
30
Ransomware claims
169
Largest
4.9M

The largest

  1. Charter 4,851,517 accounts
  2. Strategic Education Inc. 1,513,518 people United States
  3. IMA Diligence Services, LLC 525,306 people United States
  4. Kemper 269,299 accounts
  5. Plaza Home Mortgage, Inc. 137,976 people United States
  6. Mytheresa 84,108 accounts

Every breach this week, by country

United States 50

Country being checked 4

  • Charter 28 May 2026 · 4,851,517 accounts
  • Kemper 28 May 2026 · 269,299 accounts
  • Mytheresa 27 May 2026 · 84,108 accounts
  • Atlas Menu 30 May 2026 · 63,926 accounts

Ransomware claims

Gangs named 169 organisations on their leak sites this week, against 144 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.