{keyword}') Union All Select Null,null,null,null# | RECOMMENDED ★ |

This report analyzes the specific string provided: "KEYWORD') UNION ALL SELECT NULL,NULL,NULL,NULL#" . Based on its structure, this is a classic Union-based SQL Injection (SQLi) payload designed to test an application's vulnerability and map its internal database structure. Payload Breakdown The string is composed of three distinct functional parts: SQL injection UNION attacks | Web Security Academy