{keyword} Union All Select Null,null,null,null-- Uizf (2026)

: 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.

: 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: {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. : This is a SQL comment symbol

This string is a classic example of a , specifically a Union-Based SQLi attack . It is used by attackers to test for vulnerabilities or extract data from a database. Breakdown of the Payload Purpose of Such a Payload Attackers use this

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

: Confirm that the application is vulnerable to SQL injection.

: 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.