{keyword}' Union All | Select Null,null,null,null,null,null-- Vigj

The primary goal of this specific payload is . By successfully executing this command, an attacker confirms that: The application is vulnerable to SQL Injection. The original query retrieves exactly six columns. The backend database supports the UNION operator.

Once confirmed, the attacker would replace the NULL values with functions like version() , user() , or table names (e.g., information_schema.tables ) to begin exfiltrating sensitive data. Prevention and Mitigation The primary goal of this specific payload is

: The single quote ( ' ) is used to "break out" of the intended data field. By closing the string early, the attacker can append their own SQL commands. or table names (e.g.