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June 15, 2020 Verified Sensitive Record Education / Study materials platform

OneClass (2020) Data Breach

The OneClass (2020) data breach is a sensitive educational data incident that came to public attention in June 2020, involving the database of educational data left exposed on OneClass, a lecture…

1 Million
Reported Records
7
Data Types
Critical
Severity
Yes
Verification

Exposed Data Types

7
Email addresses
Names
Phone numbers
School information
Course names
Enrollment information
Account activity

Additional Information

Added DateJuly 2, 2026
Breach DateJune 15, 2020
Domainoneclass.com
SourceThird-party breach
Last Content UpdateJuly 19, 2026

Verification and editorial method

LeakData compares the incident name, date, affected-record count, and exposed data types with accessible sources. Unverified fields are not presented as facts, and records are updated when new evidence becomes available.

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Company Information

Company NameOneClass
SectorEducation / Study materials platform
CountryCanada
Websiteoneclass.com

Risk Level

Critical

The reported impact exceeds 1 million and falls within the critical severity band.

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