{keyword} Union All Select Null,null,null,null,null,null-- Gojb May 2026

If the page returns an error (like "The used SELECT statements have a different number of columns"), the attacker will try again with five or seven NULL values until the error disappears. 4. -- (The Comment) In SQL, double-dashes signify the start of a comment.

This is a SQL operator used to combine the result sets of two or more SELECT statements into a single result set. If the page returns an error (like "The

Scanners append strings like GoJB so that the security researcher can search the website's logs or the page's source code later to confirm that their input was successfully processed and reflected by the server. Summary of the Attack Flow This is a SQL operator used to combine

: This "comments out" the rest of the original SQL query written by the developers. If the page loads normally, the attacker knows

If the page loads normally, the attacker knows the database is expecting 6 columns.

Here is a detailed breakdown of what each component of this specific string does: 1. {KEYWORD}