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Weekly breach brief

Data breaches in the week of 20–26 October 2025

11 data breaches on the tracker, 11 confirmed by the organisation or a regulator.

Breaches
11
Notices in CA and WA
10
Ransomware claims
134
Largest
183.0M

The largest

  1. Synthient Stealer Log Threat Data 182,962,095 accounts

Every breach this week, by country

United States 10

Country being checked 1

Ransomware claims

Gangs named 134 organisations on their leak sites this week, against 234 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.