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

: This attempts to "break out" of the original SQL query. It provides a keyword, then uses a single quote and a closing parenthesis to trick the database into thinking the intended command has ended.

: This is used to determine the number of columns being returned by the original query. The attacker adds NULL values until the query stops returning an error, revealing the database structure. : This attempts to "break out" of the original SQL query

: 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 attempts to "break out" of the original SQL query

The string you provided is a designed to test for or exploit vulnerabilities in a database's search or filtering "feature." : This attempts to "break out" of the original SQL query