: 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.
: This is likely a "canary" or a unique identifier used by automated security scanners to confirm if the injection was successful. What should you do? : The attacker uses NULL values to figure
The string you provided is a . Specifically, it is designed to exploit a vulnerability in a database-driven application to extract unauthorized data. : The attacker uses NULL values to figure
Are you seeing this in your , or are you testing the security of your own code ? : The attacker uses NULL values to figure
: A WAF can often block these types of patterned attacks automatically.