What is a CVV test?

A CVV test is any attempt to confirm that a card number and its card verification value are valid. Developers do this legitimately in a payment sandbox using test card numbers supplied by their processor. Criminals do it illegally by running small authorizations against stolen card data, a practice the payments industry calls card testing.

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The CVV is the 3 digit code on the back of most cards, or 4 digits on the front of American Express cards. It exists to prove the person paying is holding the physical card.

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Is CVV testing illegal in the United States?

Testing a card you do not own is fraud. It falls under access device fraud, wire fraud, and identity theft statutes, and it is prosecuted federally. Marketplaces that advertise card data for sale are part of the same criminal ecosystem, so buying, selling, or validating that data carries real criminal exposure.

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Why does card testing hurt merchants?

Card testing floods a checkout with tiny transactions that are later reversed, and each reversal triggers chargeback fees and network penalties. High fraud rates can raise processing costs or lead a processor to terminate the merchant account. Small ecommerce stores are targeted most because attackers assume their fraud controls are thin.

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How do merchants detect card testing attacks?

• Spikes in low dollar orders, especially many attempts from one IP address or device.
• Multiple card numbers tried against a single customer account or email address.
• Failed authorization rates that jump sharply within minutes.
• Orders shipped to addresses that do not match the billing record.

Address verification, CVV checks, velocity limits, and bot detection on the checkout page are the standard defenses. Card networks also share fraud signals across issuers.

How can cardholders protect themselves?

Keep your card number and CVV out of emails, chat messages, and unfamiliar sites, because that is how data gets harvested in the first place. Turn on transaction alerts so a small unfamiliar charge is visible immediately. Report suspicious activity to your issuer right away.

What should you do if you spot an unfamiliar charge?

Call the number on the back of your card and ask the issuer to block the card and reverse the charge. Then file a report at IdentityTheft.gov, which produces a recovery plan, and consider a complaint with the FBI Internet Crime Complaint Center. Acting within days limits your liability and helps stop the same card data from being reused.