36.9K accounts from Hub4Tech (hub4tech.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswords
On an unknown date in approximately 2017, the Indian training and assessment service known as Hub4Tech suffered a data breach via a SQL injection attack. The incident exposed almost 37k unique email addresses and passwords stored as unsalted MD5 hashes. No response was received from Hub4Tech when contacted about the incident.
Source: Have I Been Pwned (CC BY 4.0)