SchoolMos Alleged Data Exposure
The 2021 SchoolMos data breach occurred in September 2021 when internal student, parent, and teacher databases of the Moscow Electronic School (MES / МЭШ - school.mos.ru), administered by the Moscow Department of Education, were breached and leaked online.
Exposed Data Types
6- Email addresses
- Names
- Phone numbers
- Dates of birth
- Government issued IDs
- Usernames
About This Record
What information was compromised in the SchoolMos incident?
The leaked database export (school.mos.ru.csv) contains over 17 million educational and administrative profiles. Verified exposed data classes include:
- Identity & Contact Details: Full Russian names (last, first, middle), system usernames, verified email addresses, and phone numbers.
- Government-Issued Identifiers: SNILS numbers (Individual Insurance Account Numbers, equivalent to Russian Social Security Numbers).
- Demographic Records: Dates of birth, gender, birth place, and citizenship status.
- Administrative Metadata: Unique student/teacher GUIDs, system creation and update timestamps.
How many accounts were affected?
Standardized RFC 5322 ASCII canonical verification and RFC 2606 placeholder elimination (stripping 2.38M auto-generated dummy example.com accounts) confirmed 3,319,879 unique valid real-user email addresses.
Security advisory & personal identity protection
The combination of government SNILS identifiers with birth dates and phone numbers poses severe identity theft and spear-phishing risks. Impacted users should:
- Enable two-factor authentication (2FA) on municipal and state portal accounts (such as Gosuslugi and mos.ru).
- Remain vigilant against unsolicited phone calls or messages claiming to represent government or educational departments.
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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