: Confirm that the application is vulnerable to SQL injection.
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
: This is likely a random string used as a unique identifier or "signature" to help the attacker find their specific test result in a large log file or report. Purpose of Such a Payload Attackers use this technique to: : Confirm that the application is vulnerable to