Account takeover (ATO) is a form of identity theft in which cybercriminals gain unauthorized access to legitimate accounts using stolen credentials, leading to severe consequences like data exfiltration, financial theft, and software supply chain attacks. The rise in ATO fraud is attributed to factors such as the availability of breached credentials, rampant password reuse, and the proliferation of online accounts, which expand the attack surface for cybercriminals. Corporate account takeover (CATO) specifically targets work accounts, potentially compromising sensitive company information. ATO methods include brute force attacks, credential stuffing, phishing, and keystroke logging malware. Mitigation strategies include adopting passwordless authentication, implementing multi-factor authentication (MFA), and monitoring for abnormal user activity to detect and respond to potential account takeover attempts swiftly. The growing threat of ATO emphasizes the need for organizations to enhance their security measures to protect against these increasingly sophisticated attacks.