{keyword}') Union All Select Null,null,null,null,null,null,null-- Xhdx Apr 2026

: This is a SQL comment. It tells the database to ignore everything that follows it, which prevents any remaining original code from causing a syntax error.

: This is the core of the exploit. It instructs the database to combine the results of the legitimate query with the results of a new, malicious one. : This is a SQL comment

The string you provided is a designed to test for or exploit vulnerabilities in a database's search or filtering "feature." : This is a SQL comment

In short, this is not a legitimate feature of a software product, but rather a used to see if a website is properly "sanitizing" the text that users type into search bars or forms. : This is a SQL comment