: Confirm that the application is vulnerable to SQL injection.
This string is a classic example of a , specifically a Union-Based SQLi attack . It is used by attackers to test for vulnerabilities or extract data from a database. Breakdown of the Payload {KEYWORD} UNION ALL SELECT NULL,NULL,NULL,NULL-- Uizf
: The attacker is attempting to determine the number of columns returned by the original database query. By adding NULL values until the page loads without an error, they can identify the table's structure. : Confirm that the application is vulnerable to
If you found this in a "complete report" (such as a security scan or a web server log), it indicates that an automated tool or a manual actor has the system. {KEYWORD} UNION ALL SELECT NULL,NULL,NULL,NULL-- Uizf