{keyword} Union All Select Null,null,null,null,null,null,null-- Pvwz -

Use "allow-lists" to ensure input matches the expected format (e.g., ensuring a ZIP code is only numbers).

: The attacker uses NULL values to figure out exactly how many columns the original table has. If the number of NULL s doesn't match the original column count, the database usually throws an error. Use "allow-lists" to ensure input matches the expected

: This is a comment operator in SQL. It tells the database to ignore the rest of the original query, preventing errors from trailing code. How to Prevent This Use "allow-lists" to ensure input matches the expected

The string you provided is a common technique used in . Specifically: Use "allow-lists" to ensure input matches the expected