The primary purpose of the CVV2 is to prove that the person making the purchase physically possesses the card. Because industry standards (PCI DSS) strictly prohibit merchants from storing CVV2 data after a transaction is authorized, this code is difficult for hackers to steal in mass data breaches. If a database is compromised, the attackers usually get the card number and expiration date, but rarely the CVV.
The Truth About Credit Card CVV Checkers: Risks, Reality, and Security credit card cvv checker
In cybercriminal forums (the dark web), a "CVV checker" is usually one of two things: The primary purpose of the CVV2 is to