{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 command tells the database to combine the results of the original query with a new "injected" query. {KEYWORD} UNION ALL SELECT NULL,NULL,NULL,NULL-- Uizf

: 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. : In some cases, these injections can be

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 It tells the database to ignore the rest

: 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.