Disclosure tracker › Disclosures in 2026
Intelligence · Disclosure tracker
Disclosures in 2026
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.
5,278
Disclosures in the tracker, all years
1,991
Of those, indexed in 2026
36
Added in October
13
Added in the last 7 days
7
Sectors covered
Source: LeakTrace disclosure tracker, 13 Oct 2026. Counts of records in the index, not estimates. Software advisories and security news are not counted.
3,944 results · Disclosures in 2026. Clear filters
High21 Sep 2026
Dell
Technology · Records not stated
Data breach with sensitive user data exposed
21 Sep 2026
High21 Sep 2026
Sax
Finance · Records not stated
Top US accounting firm discloses 2024 data breach impacting 220,000
21 Sep 2026
Critical21 Sep 2026
Columbia University
Education · 860,000 records
Data breach impacts 860,000 individuals
21 Sep 2026
High21 Sep 2026
Harvard
Education · Records not stated
Data breach impacting limited number of parties
21 Sep 2026
Critical21 Sep 2026
Covenant Health
Healthcare · 480,000 records
Data breach impacting nearly 480,000 people
21 Sep 2026
High21 Sep 2026
Kaplan
Education · Records not stated
Education company data breach impacting multiple people
21 Sep 2026
Critical21 Sep 2026
TransUnion
Finance · 4,400,000 records
Data breach impacting over 4.4 million people
21 Sep 2026
High21 Sep 2026
Estée Lauder
Retail · Records not stated
Data breach via Oracle E-Business Suite flaw
21 Sep 2026
Critical21 Sep 2026
CHC
Healthcare · 1,000,000 records
US healthcare provider breach impacting 1 million patients
21 Sep 2026
High21 Sep 2026
Novocure
Healthcare · Records not stated
Data breach affecting more than 1,400 cancer patients
21 Sep 2026
Critical21 Sep 2026
Unlimited Technology Systems
Sector not stated · 3,800,000 records
Data breach impacting 3.8 million people
21 Sep 2026
Critical21 Sep 2026
Ticketmaster via Snowflake
Technology · 560,000,000 records
Massive 2024 cyberattack campaign affecting at least 100 million people across 165 companies including Ticketmaster
21 Sep 2026
High21 Sep 2026
Cell C
Technology · Records not stated
South African telecom provider confirmed data breach following 2024 cyberattack
21 Sep 2026
Critical21 Sep 2026
Ransomware attack
Healthcare · 1,200,000 records
Ransomware attack exposed personal data of 1.2 million individuals
21 Sep 2026
Critical21 Sep 2026
Marquis Software Solutions
Finance · Records not stated
Ransomware attack exposed 788,000 financial records including names, addresses, card numbers
21 Sep 2026
Critical21 Sep 2026
AT&T
Technology · 109,000,000 records
Two separate incidents exposed data from over 100 million customers in 2024
21 Sep 2026
High21 Sep 2026
Essex NHS Trust
Healthcare · 900,000 records
NHS trust breach: thousands of patient records stolen in cyber attack, disclosed 6+ months after notification
21 Sep 2026
Critical21 Sep 2026
Veradigm
Healthcare · Records not stated
Electronic health records company: hackers infiltrated vendor systems and stole customer health data
21 Sep 2026
High21 Sep 2026
Home Depot
Retail · Records not stated
Leaked private GitHub token gave unauthorized access to internal systems for over a year
21 Sep 2026
High21 Sep 2026
US Government
Government · 53,070 records
53,070 passwords associated with U.S. government email domains exposed in public sources since 2024
21 Sep 2026
High21 Sep 2026
Paylogix
Technology · Records not stated
Employee benefits platform: hackers stole financial and health data from tens of thousands via Akira ransomware
21 Sep 2026
Critical21 Sep 2026
MCBS
Healthcare · 1,200,000 records
Medical business management company breach exposed personal data of 1.2 million individuals
21 Sep 2026
Critical21 Sep 2026
Bankinter/EVO Banco
Finance · 1,270,000 records
API vulnerability exposed financial and identity data of 1.27 million people in Spain
21 Sep 2026
High21 Sep 2026
Burger King Russia
Finance · 3,155,792 records
3,155,792 records exposed, Dates of birth, Email addresses, Genders, Geographic locations and 2 more
21 Sep 2026
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