20.5M accounts from ShopBack (shopback.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesGeographic locationsNamesPasswordsPhone numbers
In September 2020, the cashback reward program ShopBack suffered a data breach. The incident exposed over 20 million unique email addresses along with names, phone numbers, country of residence and passwords stored as salted SHA-1 hashes. The data was provided to HIBP by dehashed.com.
Source: Have I Been Pwned (CC BY 4.0)