{keyword}' Union All Select Null,null,null,null,null-- Bwmv Official

: The attacker is trying to determine how many columns the original database table has. If the number of NULL values doesn't match the number of columns in the original query, the database will return an error. By adding or removing NULL s, an attacker can find the exact table structure.

The string you provided, '{KEYWORD}' UNION ALL SELECT NULL,NULL,NULL,NULL,NULL-- bWmV , is a classic example of a used for database exploitation and security testing. What this string does {KEYWORD}' UNION ALL SELECT NULL,NULL,NULL,NULL,NULL-- bWmV

: This is the core of the attack. It tells the database to append the results of a second query to the results of the first one. : The attacker is trying to determine how

: Always filter and validate data coming from users. The string you provided, '{KEYWORD}' UNION ALL SELECT

: This attempts to "break out" of a standard text input field in a web application by closing the developer's intended SQL query quote early.