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

This specific string is designed to be appended to a vulnerable input field (the {KEYWORD} in your example) to probe the database structure: : Closes the original string literal in the SQL query.

NULL is used because it is compatible with almost any data type (string, integer, date, etc.), ensuring the query won't fail due to data type mismatches. This specific string is designed to be appended

: This is a SQL comment, which tells the database to ignore the rest of the original, legitimate query that follows. The Goal of the Attack This specific string is designed to be appended

If the original query has 8 columns, the page will likely load normally or show an extra row of empty data. This specific string is designed to be appended

: Appends a new set of results to the original query's output.