Credential abuse is a cybersecurity threat where attackers use stolen, leaked, or otherwise compromised usernames and passwords to gain unauthorized access to accounts, networks, or systems. This technique often exploits the common practice of password reuse across multiple services. Attackers may obtain credentials through phishing, data breaches, or malware, and then use automated tools to test these credentials on various platforms. Successful credential abuse can lead to data theft, financial loss, or further infiltration of an organization’s infrastructure. Preventive measures include enforcing strong password policies, implementing multi-factor authentication, and monitoring for unusual login activities. Regularly educating users about phishing and credential security is also crucial.