All Select Null,null,null,null,null,null# - {keyword}) Union

: This is the core of the attack. The UNION operator combines the results of two or more SELECT statements into a single result set. ALL ensures that duplicate rows are kept.

: This treats user input as data, not as executable code. {KEYWORD}) UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL#

: Most modern frameworks like Hibernate or Entity Framework handle this protection automatically. : This is the core of the attack

: In MySQL, the hash symbol marks the rest of the line as a comment . This effectively deletes any remaining parts of the original developer's code (like a trailing WHERE clause or a closing quote) that would otherwise cause a syntax error. Why This Matters : This treats user input as data, not as executable code

The string you provided is a specific used to test for vulnerabilities in a database. It is designed to trick a web application into running a second, unauthorized query and appending the results to the original one. Breakdown of the Payload

To protect your application from this type of attack, you should avoid building queries using simple string concatenation. Instead, use:

: Only allow expected characters and formats.