Broken Authentication refers to weaknesses in an API’s authentication mechanisms that allow attackers to compromise authentication tokens or exploit implementation flaws to impersonate users. Common issues include poor password policies, predictable login endpoints, exposed authentication tokens, and failure to invalidate sessions after logout or password changes. These flaws can lead to unauthorized access and data breaches. To prevent this, use strong authentication methods like multi-factor authentication, securely store and transmit credentials, implement token expiration and rotation, and follow best practices for session management and error handling. Authentication should always be consistent, secure, and regularly tested for vulnerabilities.
