Introduction to API2:2019 Broken User Authentication
Broken User Authentication, listed as API2:2019 in the OWASP API Security Top 10, occurs when authentication mechanisms are poorly implemented, allowing attackers to compromise user accounts or impersonate other users. Common causes include weak or missing authentication, poor password management, lack of token validation, or predictable credential recovery processes. These flaws can lead to unauthorized access to sensitive data and system functions. APIs are especially vulnerable due to stateless communication and reliance on tokens, so strong authentication controls, secure token handling, and multi-factor authentication are essential to prevent this type of attack.
