Even if it didn’t outright display the code you need to enter, my guess is this and similar implementations hide further vulnerabilities like: the numbers aren’t generated with a secure random number generator, or the validation call isn’t resistant to simple brute force quickly guessing every possible number, or the number is known client side for validation, etc.
Even if it didn’t outright display the code you need to enter, my guess is this and similar implementations hide further vulnerabilities like: the numbers aren’t generated with a secure random number generator, or the validation call isn’t resistant to simple brute force quickly guessing every possible number, or the number is known client side for validation, etc.