444K accounts from ProctorU (proctoru.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesNamesPasswordsPhone numbersPhysical addressesUsernames
In June 2020, the online exam service ProctorU suffered a data breach which was subsequently shared extensively across online hacking communities. The breach contained 444k user records including names, email and physical addresses, phones numbers and passwords stored as bcrypt hashes. The data was provided to HIBP by breachbase.pw.
Source: Have I Been Pwned (CC BY 4.0)