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

The provided input is a UNION-based SQL injection payload designed to determine the number of columns in a database query by matching column counts with NULL values. This reconnaissance technique often uses comment indicators ( -- ) to bypass original query constraints, aiming to eventually exfiltrate data from the backend database. For a detailed explanation, read the full article at PortSwigger . SQL injection UNION attacks | Web Security Academy