565K accounts from Universarium (universarium.org) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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In approximately November 2019, the Russian "Remote preparatory faculty for IT specialties" Universarium suffered a data breach. The incident exposed 565k email addresses and passwords in plain text. Universarium did not respond to multiple attempts to make contact over a period of many weeks. The data was provided to HIBP by dehashed.com.
Source: Have I Been Pwned (CC BY 4.0)