Start by identifying all the input points in the application:
Inspect the source code for form inputs (e.g., username, password, and hidden fields like CSRF tokens).
Use browser developer tools to view all network requests made by the application. Look for parameters in the query string (GET requests) and in the body of POST requests.
Record all discovered parameters and their expected input formats.
Step 2: Feed Parameters to SQLmap
Once you've gathered all parameters, you can test for SQL injection vulnerabilities using SQLmap:
Start SQLmap with a specific URL, including query parameters, for GET requests: