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.
5,558
Disclosures in the tracker, all years
2,108
Of those, indexed in 2026
25
Added in November
32
Added in the last 7 days
7
Sectors covered
Source: LeakTrace disclosure tracker, 5 Nov 2026. Counts of records in the index, not estimates. Software advisories and security news are not counted.
Critical1 May 2026
DentaQuest
Healthcare · 15,000,000 records
15 million patients impacted in largest healthcare data breach of 2026; dental benefits administrator breached in May
1 May 2026
High1 May 2026
Canvas
Education · Records not stated
Ongoing data extortion attack on education technology platform affecting schools nationwide
1 May 2026
Critical1 May 2026
DentaQuest
Healthcare · 15,000,000 records
15 million patients impacted, largest healthcare data breach of 2026, occurred in May
1 May 2026
High1 May 2026
Canvas
Education · Records not stated
Education technology platform targeted by data extortion attack affecting schools nationwide
1 May 2026
Critical1 May 2026
Foxconn
Technology · Records not stated
Ransomware attack; hackers stole 8 terabytes of data from electronics manufacturer
1 May 2026
Critical1 May 2026
Canvas
Education · Records not stated
Ransomware attack shut down education platform used by thousands of universities and K-12 schools during finals week
1 May 2026
High1 May 2026
Canvas (education platform)
Education · Records not stated
Ransomware attack shut down platform used by thousands of schools and universities
1 May 2026
High1 May 2026
Canvas
Education · Records not stated
Data extortion attack on education platform disrupted schools and colleges nationwide
1 May 2026
Critical1 May 2026
NYC Health and Hospitals
Healthcare · 1,800,000 records
Breach exposed medical records, fingerprints, and geolocation data of 1.8M people; attackers had access 2+ months
1 May 2026
High1 May 2026
Atrium Health Navicent
Healthcare · Records not stated
Patient records system experienced data breach exposing patient records and personal information
1 May 2026
Critical1 May 2026
Foxconn
Technology · Records not stated
Ransomware group stole 8 terabytes of data from electronics manufacturer
1 May 2026
Critical1 May 2026
DentaQuest
Healthcare · 15,000,000 records
Cyberattack in May 2026 impacted 15 million patients, largest healthcare breach of 2026
1 May 2026
High1 May 2026
Canvas
Education · Records not stated
Data extortion attack affecting education technology platform disrupted classes nationwide
1 May 2026
Critical1 May 2026
DentaQuest
Healthcare · 15,000,000 records
15 million patients impacted; largest healthcare data breach of 2026
1 May 2026
High1 May 2026
Google Gemini AI
Technology · Records not stated
AI breach affecting three companies in May confirmed after 4-month delay in disclosure
1 May 2026
Critical1 May 2026
Canvas (Instructure)
Education · 275,000,000 records
Ransomware attack affecting 275M records from education platform used by schools nationwide
1 May 2026
High1 May 2026
Canvas
Education · Records not stated
Data extortion attack disrupted schools and colleges nationwide
1 May 2026
Critical1 May 2026
NYC Health and Hospitals
Healthcare · 1,800,000 records
Breach exposed medical records, fingerprints, and geolocation data of 1.8 million people
1 May 2026
Critical1 May 2026
Foxconn
Technology · Records not stated
Ransomware attack on North American facilities with claims of stolen Apple and Nvidia data, 8TB stolen
1 May 2026
High1 May 2026
Canvas
Education · Records not stated
Data extortion attack on education technology platform disrupting schools and colleges nationwide
1 May 2026
Critical1 May 2026
DentaQuest
Healthcare · 15,000,000 records
15M patients impacted in largest healthcare data breach of 2026; May 2026 incident
1 May 2026
Critical1 May 2026
Canvas (Instructure)
Education · 275,000,000 records
ShinyHunters breached educational platform; 275M records exposed affecting schools nationwide
1 May 2026
Critical1 May 2026
Canvas
Education · 275,000,000 records
ShinyHunters breach exposed 275 million records from educational platform affecting schools nationwide
1 May 2026
Critical1 May 2026
NYC Health + Hospitals
Healthcare · 1,800,000 records
Hackers stole biometric data including fingerprints and medical data from 1.8 million people. Network access lasted over 2 months before detection.
1 May 2026
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