{keyword} Union All Select Null,null,null,null-- Uizf • Official

If you found this in a "complete report" (such as a security scan or a web server log), it indicates that an automated tool or a manual actor has the system.

: Confirm that the application is vulnerable to SQL injection. {KEYWORD} UNION ALL SELECT NULL,NULL,NULL,NULL-- Uizf

: This command tells the database to combine the results of the original query with a new "injected" query. If you found this in a "complete report"

: Once the column count is known, they replace the NULL values with actual commands (e.g., version() , user() , or table_name ) to steal sensitive information. : Once the column count is known, they

This string is a classic example of a , specifically a Union-Based SQLi attack . It is used by attackers to test for vulnerabilities or extract data from a database. Breakdown of the Payload

: This is a SQL comment symbol. It tells the database to ignore the rest of the original, legitimate query, effectively "breaking" the intended logic to execute the injected code.