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

: Once the column count is known, they replace the NULL values with actual commands (e.g., version() , user() , or table_name ) to steal sensitive information.

: This is a SQL comment symbol. It tells the database to ignore the rest of the original, legitimate query, effectively "breaking" the intended logic to execute the injected code. {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. : Once the column count is known, they

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. : The attacker is attempting to determine the

: In some cases, these injections can be used to log in without a valid password.