Weekly briefing No. 41 published 4 Oct 2026
Intelligence · Disclosure tracker

Every public disclosure, dated and sourced.

Public breach disclosures from regulators, court filings, company notices and news reporting, each recorded with its date and a link to the original. Updated daily.

5,324
Disclosures in the tracker, all years
2,038
Of those, indexed in 2026
86
Added in October
22
Added in the last 7 days
7
Sectors covered

Source: LeakTrace disclosure tracker, 21 Oct 2026. Counts of records in the index, not estimates. Software advisories and security news are not counted.

Worldwide · How they got in

Incidents worldwide, by country.

72 incidents from 9 countries in the last 90 days, each from a public source and reviewed before it is shown. Where the source says how the attackers got in, the row says so.

  1. United States21 Oct 2026Critical infrastructure organizations worldwideHow they got in: stolen or reused passwords.BleepingComputer
  2. United States20 Oct 2026Conduent Business Services, LLCThe source does not say how they got in.HIPAA Journal
  3. United States20 Oct 2026Central Ohio Primary Care PhysiciansHow they got in: stolen or reused passwords.HIPAA Journal
  4. United States20 Oct 2026Educational Testing ServiceThe source does not say how they got in.The Record
  5. United States20 Oct 2026Chevy Chase ClubThe source does not say how they got in.Vermont Attorney General
  6. United States20 Oct 2026Paradigm Healthcare ServicesThe source does not say how they got in.SecurityWeek
  7. United States19 Oct 2026Computer Task Group, IncorporatedThe source does not say how they got in.Vermont Attorney General
  8. United States19 Oct 2026Citizens BankThe source does not say how they got in.California Attorney General
  9. United States19 Oct 2026STS Aviation GroupThe source does not say how they got in.California Attorney General
  10. United States18 Oct 2026Stitch Connect IncThe source does not say how they got in.California Attorney General
  11. United States17 Oct 2026Catawba CountyThe source does not say how they got in.Vermont Attorney General
  12. United States16 Oct 2026Johnson Investment CounselThe source does not say how they got in.Vermont Attorney General
Critical31 Jul 2026
MCBS
Healthcare · 1,200,000 records
Data breach affecting 1.2 million individuals at Atlanta-based medical business management company
31 Jul 2026
High31 Jul 2026
Illuminate Education
Education · Records not stated
Data breach at Wisconsin-based edtech company; settled with FTC requiring implementation of security program
31 Jul 2026
High31 Jul 2026
Thailand Ministry of Finance
Government · Records not stated
Hackers used autonomous AI agent for cyber-espionage campaign
31 Jul 2026
High31 Jul 2026
KT Corporation
Technology · Records not stated
Customer data breach at South Korean telecommunications company, fined $39 million
31 Jul 2026
Critical31 Jul 2026
PIH Health
Healthcare · 2,950,000 records
2024 ransomware hacking incident exposed 2.95 million patient records
31 Jul 2026
High31 Jul 2026
FRANCE TRAVAIL
Government · Records not stated
Hackers breached information system in Q1 2024, resulting in €5 million fine from CNIL
31 Jul 2026
High31 Jul 2026
TransUnion
Finance · 37,000 records
2019 breach exposed 37,000 people's credit and personal data
31 Jul 2026
High31 Jul 2026
Mizuno
Retail · Records not stated
Japanese sportswear company confirms data breach following 2024 ransomware attack affecting customers
31 Jul 2026
Critical31 Jul 2026
Meta
Technology · Records not stated
2018 breach resulting in €251 million GDPR fine by EU privacy regulator
31 Jul 2026
High31 Jul 2026
CommonSpirit Health
Healthcare · 19,027 records
19,027 patient records exposed with personal and medical information
31 Jul 2026
High31 Jul 2026
Essex NHS Trust
Healthcare · 900,000 records
Thousands of patient records stolen in ransomware cyberattack by Synnovis
31 Jul 2026
Critical31 Jul 2026
TriZetto
Healthcare · 3,400,000 records
3.4 million people's health and personal data stolen in 2024 cyberattack
31 Jul 2026
Critical31 Jul 2026
US Government Agencies
Government · Records not stated
Thousands of civil servants' passwords exposed since early 2024, including White House linked passwords
31 Jul 2026
High31 Jul 2026
Gaming Accounts (Multiple)
Technology · Records not stated
11 million gaming account credentials exposed
31 Jul 2026
Critical31 Jul 2026
Medical Billing Company (Unnamed)
Healthcare · 1,300,000 records
2025 ransomware attack exposed protected health data of 1.3 million people leaked to dark web
31 Jul 2026
High31 Jul 2026
Tribeca Festival
Sector not stated · 666,000 records
Data leak exposed 666,000 records including celebrity contact information
31 Jul 2026
Critical31 Jul 2026
Charter Spectrum
Technology · 42,000,000 records
Data breach exposed 4.9M confirmed accounts; ShinyHunters claims 42M records stolen
31 Jul 2026
Critical31 Jul 2026
Bankinter / EVO Banco
Finance · 1,270,000 records
API vulnerability exposed financial and identity data of 1.27 million records in 2024
31 Jul 2026
Critical31 Jul 2026
UnitedHealthcare
Healthcare · Records not stated
2024 cyberattack exposed sensitive health and insurance data from millions of patients
31 Jul 2026
Critical31 Jul 2026
Medical Billing Company (unnamed)
Healthcare · 1,300,000 records
2025 ransomware attack exposed protected health data on 1.3 million people; leaked to dark web
31 Jul 2026
Critical31 Jul 2026
McLaren Health Care
Healthcare · Records not stated
Two ransomware breaches in 2023-2024 affected 3.2 million victims; settled lawsuit for $14M
31 Jul 2026
High31 Jul 2026
Transport for London
Government · Records not stated
Cyber attack on London transport network infrastructure cost £39M; two hackers jailed
31 Jul 2026
Critical31 Jul 2026
Qantas
Sector not stated · 5,670,000 records
Vishing attack exposed 5.67 million customer records
31 Jul 2026
High31 Jul 2026
South Florida Injury Centers
Healthcare · 1,525 records
Data breach exposed SSNs and medical records of 1,525 individuals
31 Jul 2026
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