In recent times, you might have noticed user accounts being compromised by the millions, and yet companies refute these claims saying that their systems are secure and have not been attacked. In these cases, the companies are right – instead of a direct attack, the hackers may have performed an attack called ‘credential stuffing’. In this type of attack, hackers get their hands on usernames and passwords of one application or service and stuff the same credentials on another login for another digital provider.