25.7M accounts from Mathway (mathway.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Device informationEmail addressesNamesPasswordsSocial media profiles
In January 2020, the math solving website Mathway suffered a data breach that exposed over 25M records. The data was subsequently sold on a dark web marketplace and included names, Google and Facebook IDs, email addresses and salted password hashes.
Source: Have I Been Pwned (CC BY 4.0)