What is the most crucial step to take immediately after identifying a potential security breach affecting your website and AdSense account?

The most crucial step to take immediately after identifying a potential security breach affecting your website and AdSense account is to secure your website and AdSense account by changing passwords, enabling two-factor authentication, and reviewing security settings. This is paramount to prevent further unauthorized access and potential damage. Simultaneously, you should notify Google about the potential breach to allow them to monitor your account for suspicious activity and provide guidance on remediation steps. This proactive approach minimizes the risk of unauthorized ad code injection, invalid traffic generation, or other malicious activities that can violate AdSense policies and lead to account penalties. Addressing the security vulnerabilities and notifying Google are the immediate priorities.