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

: 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.

: 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

: This command tells the database to combine the results of the original query with a new "injected" query.

: 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. : This represents the original search term or input field

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

: 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: : This is a SQL comment symbol

: 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.