{keyword}' Union All Select Null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null From Msysaccessobjects-- Grlt [RECOMMENDED]

The text you provided is a specific type of used to exploit vulnerabilities in applications using a Microsoft Access database. It is a diagnostic tool designed to determine the number of columns in a database table. Breakdown of the Payload Components

: Targets a standard internal system table unique to Microsoft Access to confirm the database type. The text you provided is a specific type

: A comment indicator that tells the database to ignore the rest of the original query, preventing syntax errors from trailing code. : A comment indicator that tells the database

: Likely a unique identifier or "signature" used by automated vulnerability scanners (such as Burp Suite or sqlmap ) to track and identify successful injections in the server's response. Why This is Used Security professionals and attackers use these strings to: : Placeholders used to match the number of

: Combines the results of the original query with the results of the injected query.

: Placeholders used to match the number of columns in the original table. If the number of NULL values matches the column count, the query succeeds; otherwise, it returns an error.

: Closes the original string literal in the application's query to allow the attacker to append their own SQL commands.