Ask HN: Why are my CVV numbers the same?

2 pointsrfjedwards3 comments

I have two Mastercards, with two different card numbers and expiry dates, issued at different times, from different institutions, with different variations of my name on each.

The CVV numbers on them are exactly the same.

Is it a one-in-999 coincidence?

Or is this exposing an exploitable weakness in however the CVVs are generated?

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