{keyword}') Union All Select Null,null,null,null,null,null,null-- Hofz -

The string you provided is a . Specifically, it is designed to exploit a vulnerability in a database-driven application to extract unauthorized data.

Are you seeing this in your , or are you testing the security of your own code ? The string you provided is a

: The attacker uses NULL values to figure out how many columns are in the original database table. If the number of NULL s doesn't match the number of columns in the original query, the database will return an error. the database will return an error.