Select Null,null,null,null-- Uizf | {keyword} Union All

: This represents the original search term or input field. The attacker appends the malicious code to this keyword.

: Confirm that the application is vulnerable to SQL injection. {KEYWORD} UNION ALL SELECT NULL,NULL,NULL,NULL-- Uizf

: In some cases, these injections can be used to log in without a valid password. : This represents the original search term or input field

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