An SQL injection vulnerability occurs when a malicious user or attacker injects special characters into the application's input fields. Any application that fails to apply a validation or implements a poor validation technique is susceptible to SQL injection vulnerabilities. The attacker's malicious inputs are now inserted into a SQL query parameter, which in turn is considered for execution by the database engine. The database interpreter considers the inserted special characters as SQL commands rather than malicious special characters. As a result of the execution of a query with malicious user$-$supplied data, sensitive information is fetched from the database and displayed on the front end.

Error$-$based SQL injection attack confirms the vulnerability by revealing database$-$specific exceptions or error messages to the end$-$user or attacker. Question : Explain why could you login with the wrong username?