An OAuth attack is a type of cyberattack that targets the OAuth authorization protocol, which is commonly used to allow users to log in to websites or apps using credentials from another service, like Google or Facebook. Attackers exploit weaknesses or misconfigurations in the OAuth process to gain unauthorized access to user accounts and sensitive data, often without the victim realizing it. These attacks can occur through phishing, malicious applications, or manipulating redirect URLs. Proper implementation and user awareness are crucial to prevent such attacks and protect personal information.