Online Shopping Portal Project 3.1 allows remote attackers to execute arbitrary SQL commands/queries via the login form, leading to unauthorized access and potential data manipulation. This vulnerability arises due to insufficient validation of user-supplied input in the username field, enabling SQL Injection attacks.
An SQL Injection vulneraility exists in https://phpgurukul.com Online Shopping Portal 3.1 via the email parameter on the /check_availability.php endpoint that serves as a checker whether a new user's email is already exist within the database.