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.
5,280
Disclosures in the tracker, all years
1,993
Of those, indexed in 2026
39
Added in October
9
Added in the last 7 days
7
Sectors covered
Source: LeakTrace disclosure tracker, 15 Oct 2026. Counts of records in the index, not estimates. Software advisories and security news are not counted.
3,947 results · Disclosures in 2026. Clear filters
Critical1 May 2026
DentaQuest
Healthcare · 15,000,000 records
15 million patient records stolen in largest healthcare data breach of 2026 (May incident)
1 May 2026
Critical1 May 2026
Instructure (Canvas)
Education · Records not stated
Ransomware attack on Canvas learning management system affecting thousands of schools nationwide
1 May 2026
High1 May 2026
Canvas
Education · Records not stated
Massive data breach affecting schools nationwide from ransomware attack and extortion
1 May 2026
Critical1 May 2026
DentaQuest
Healthcare · 15,000,000 records
15 million patients impacted in largest healthcare breach of 2026, second-largest dental benefits administrator in U.S.
1 May 2026
Medium1 May 2026
7-Eleven
Retail · Records not stated
Unauthorized third party gained access to systems storing franchisee documents in confirmed data breach
1 May 2026
High1 May 2026
Canvas
Education · Records not stated
Massive data breach affecting schools nationwide; extortion attack on education platform
1 May 2026
Critical1 May 2026
Instructure (Canvas platform)
Education · Records not stated
Supply chain breach driving 58% of all breach notices in 2026
1 May 2026
Critical1 May 2026
DentaQuest
Healthcare · 15,000,000 records
Second-largest dental benefits administrator breached; 15M patients impacted in largest 2026 healthcare breach
1 May 2026
High1 May 2026
West Pharmaceutical Services
Healthcare · Records not stated
Ransomware attack forced systems offline globally, disrupting operations
1 May 2026
High1 May 2026
Canvas (Instructure)
Education · Records not stated
Ransomware attack shut down education platform used by universities and K-12 schools across US, impacting thousands of students during finals week
1 May 2026
High1 May 2026
Canvas
Education · Records not stated
Massive data breach affecting schools and colleges nationwide, with data extortion attack
1 May 2026
Critical1 May 2026
DentaQuest
Healthcare · 15,000,000 records
15 million patients impacted in largest healthcare breach of 2026
1 May 2026
Critical1 May 2026
African National Congress (ANC)
Sector not stated · Records not stated
2 million private member records exposed and sold by hacker group on dark web
1 May 2026
High1 May 2026
Canvas
Education · Records not stated
Massive data breach affecting schools and colleges nationwide; causes exam postponements
1 May 2026
Critical1 May 2026
DentaQuest
Healthcare · 15,000,000 records
15 million patients impacted; largest healthcare data breach of 2026, breached in May
1 May 2026
High1 May 2026
7-Eleven
Retail · Records not stated
Data breach confirmed after ShinyHunters claims; documents related to franchises compromised
1 May 2026
High1 May 2026
Canvas
Education · Records not stated
Massive data breach affecting schools and colleges nationwide; University of Illinois and Illinois State University impacted
1 May 2026
High1 May 2026
7-Eleven
Retail · Records not stated
Data breach confirmed; hackers breached system storing franchise-related documents
1 May 2026
Critical1 May 2026
African National Congress (ANC)
Sector not stated · Records not stated
Data breach exposed 2 million private member records offered for sale by hacker group
1 May 2026
High1 May 2026
Idaho State University
Education · Records not stated
Ransomware attack disrupted operations and finals week at the university and thousands of other schools
1 May 2026
High1 May 2026
Canvas
Education · Records not stated
Massive data breach affecting schools nationwide, disrupted classes and coursework at universities
1 May 2026
High1 May 2026
Queensland Schools
Education · Records not stated
Tens of thousands of students and teachers affected in one of most significant education tech breaches
1 May 2026
High1 May 2026
Atrium Health Navicent
Healthcare · Records not stated
Patient records system experienced data breach potentially exposing patient records and personal information.
1 May 2026
Critical1 May 2026
Foxconn
Technology · Records not stated
8 terabytes of data stolen in ransomware attack on electronics manufacturing facilities
1 May 2026
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