[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$f1jy9hgu5i64p4":3},{"success":4,"breach":5},true,{"_id":6,"name":7,"title":8,"slug":9,"domain":10,"breachDate":11,"addedDate":12,"publishedAt":13,"modifiedDate":14,"contentUpdatedAt":15,"source":16,"sourceUrl":17,"sourceUrls":18,"pwnCount":19,"affectedCount":19,"affectedCountStatus":20,"affectedCountLowerBound":13,"affectedCountUnit":21,"hasEnglishDescription":4,"contentLocale":22,"availableLocales":23,"translations":25,"severity":28,"dataClasses":29,"description":37,"seoTitle":38,"seoDescription":39,"logoUrl":40,"isVerified":4,"isSensitive":4,"isSpamList":41,"isMalware":41,"company":42},"6a46d3255632e212ecce5f47","OneClass 2020","OneClass (2020) Data Breach","oneclass-2020","oneclass.com","2020-06-15T00:00:00.000Z","2026-07-02T21:07:49.225Z",null,"2026-07-03T14:14:47.866Z","2026-07-19T00:10:22.755Z","Third party breach","",[],1000000,"known","unknown","en",[22,24],"tr",{"en":26,"tr":27},{"slug":9},{"slug":9},"Critical",[30,31,32,33,34,35,36],"Email addresses","Names","Phone numbers","School information","Course names","Enrollment information","Account activity","\u003Cp>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 notes, study materials, and student support platform associated with the oneclass.com domain. The record was evaluated in the Canadian context, the number of affected individuals was kept at 1,000,000+, and the data classes were limited to email addresses, first and last name information, phone numbers, school information, course names, registration\u002Fenrollment information, and account activity.Reliable security news and investigative reports from external control support that education and communication data associated with more than one million people became accessible in an exposed database; therefore, the record was verified and kept classified. Since there was no password field in the OneClass record, the disclosure was not written as a password leak; the risk was explained based on the visibility of education ID, contact information, and account activity data together.\u003C\u002Fp>\u003Cp>To prevent duplicate records, the title, domain name, event period, number of affected individuals, educational platform context, and data classes were compared. This record is only associated with the open database incident on the OneClass educational platform; different school systems, other educational applications, or similar ed-tech incidents that occurred during the same period are not included in this record.\u003C\u002Fp>\u003Ch2>Leaking Data Types and Risks\u003C\u002Fh2>\u003Cp>In this record, the supported data fields have been kept as email addresses, name-surname information, phone numbers, school information, course names, enrollment information, and account activity. While the email address and phone number directly create a contact risk, school information, course names, enrollment information, and account activity can lead to a more detailed profile of the person's educational life. Since the password field is not supported, this record is not described as a password leak; however, the combination of educational identity with contact information increases the risk of targeted phishing, fake student support messages, and social engineering.\u003C\u002Fp>\u003Cul>\u003Cli>Students and educators may be targeted with fake school, scholarship, grade, or support messages.\u003C\u002Fli>\u003Cli>The risk of multi-channel fraud increases when phone numbers and email addresses appear together.\u003C\u002Fli>\u003Cli>School and course information can make messages appear personal and believable.\u003C\u002Fli>\u003Cli>Account activity can provide additional context about the user's behavior on the platform.\u003C\u002Fli>\u003C\u002Ful>\u003Ch2>Verified Scope and Boundaries\u003C\u002Fh2>\u003Cp>For OneClass (2020), the verified scope includes the oneclass.com domain, the June 2020 period, 1,000,000+ people, and data classes such as email addresses, first and last names, phone numbers, school information, course names, enrollment information, and account activity. This incident is kept in verified status as it is supported by reliable independent publications and researcher findings. However, the description does not extend beyond the supported data fields and does not suggest the existence of fields such as passwords, payment card details, official ID numbers, or private message content.\u003C\u002Fp>\u003Cp>The reason the record is marked as sensitive is that it makes the school, course, and contact information of students and education-related individuals visible in the same framework. Although such data does not contain financial information on its own, it can increase the risk of creating personal profiles, targeted fraud, and exerting pressure through educational identity.\u003C\u002Fp>\u003Ch2>User Groups at Risk\u003C\u002Fh2>\u003Cp>The primary risk group is considered to be students, instructors, applicants using OneClass, and individuals whose contact information is associated with an education account. Students, parents, instructors, and academic support accounts should be more cautious against personalized messages containing an educational context. The risk of cross-targeting is especially higher for individuals who use the same email or phone number in school, scholarship, banking, social media, and job applications.\u003C\u002Fp>\u003Cul>\u003Cli>Students who have a OneClass account or an educational profile\u003C\u002Fli>\u003Cli>People who use phone and email information together with school accounts\u003C\u002Fli>\u003Cli>Users who can receive targeted messages based on class, school, or enrollment information\u003C\u002Fli>\u003Cli>People who tend to quickly click on links coming from educational platforms\u003C\u002Fli>\u003C\u002Ful>\u003Ch2>Urgent Measures to Be Taken\u003C\u002Fh2>\u003Cp>If you have an account or educational profile associated with OneClass, carefully review unexpected course grade, school support, scholarship, account verification, or refund messages received via email and phone. Even though a password field is not supported in this record, enabling multi-factor authentication on critical accounts used with the same email address and updating account recovery information would be safe.\u003C\u002Fp>\u003Cul>\u003Cli>Enable multi-factor authentication on your email account.\u003C\u002Fli>\u003Cli>Do not open school, scholarship, or support-themed links that come to your phone without verifying them.\u003C\u002Fli>\u003Cli>Check the recovery options for critical accounts used with the same email address.\u003C\u002Fli>\u003Cli>Directly verify payment and verification requests received on behalf of the educational institution or platform through the official channel.\u003C\u002Fli>\u003C\u002Ful>\u003Ch2>Long-Term Security Strategies\u003C\u002Fh2>\u003Cp>For long-term protection on education platforms, it is necessary to separate email addresses according to their purpose of use, enable multi-factor authentication on school accounts, and approach education-themed links received via SMS and email with caution. Educational data can affect the user not only in terms of account security but also in terms of personal profile inference.\u003C\u002Fp>\u003Cp>Good practice for schools, course platforms, and students is to regularly conduct access audits against open database risks, close unused accounts, limit data retention periods, and raise phishing awareness among students. The OneClass incident is an example showing that non-password educational data can also pose serious privacy risks.\u003C\u002Fp>\u003Ch2>Record Control and User Action\u003C\u002Fh2>\u003Cp>Users checking the OneClass (2020) record on LeakData.io should, if they see a result, determine which email address or phone number is affected, with which school or course context this information might be associated, and on which other accounts the same contact information has been used. The goal is not to panic, but to strengthen defense against fake messages that could be associated with an educational identity.\u003C\u002Fp>\u003Cp>If any new official notification, regulatory record, or reliable independent news emerges regarding the OneClass (2020) data breach, the scope may be reassessed. As it stands, the record is maintained as a verified, sensitive, and education data-focused incident; users should carefully protect their communication channels and school accounts.\u003C\u002Fp>","OneClass (2020) Data Breach (1 Million Reported Records)","OneClass (2020) Data Breach. 1 Million reported records are reported. Reported data: Email addresses, Names, Phone numbers. Review the scope, risks, and…","\u002Fuploads\u002Flogo\u002Foneclass-2020.svg",false,{"name":43,"sector":44,"country":45,"website":10,"websiteArchiveUrl":17,"websiteStatus":17,"websiteCheckedAt":13},"OneClass","Education \u002F Study materials platform","Canada"]