: This command tells the database to combine the results of the original query with a new "injected" query.
: 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 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 command tells the database to combine
: 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 is likely a random string used
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.
: In some cases, these injections can be used to log in without a valid password.