{keyword}') Union All Select Null,null,null,null,null,null,null,null,null-- Zljd Apr 2026

The string is constructed to "break out" of a standard search query and force the database to execute a new, malicious command.

: This is the SQL comment symbol. It tells the database to ignore everything that follows it in the code, effectively "muting" the rest of the original, legitimate query. The string is constructed to "break out" of

: These are placeholders. For a UNION attack to work, the second query must have the exact same number of columns as the first. Attackers use NULL to test and match the column count without causing data type errors. The string is constructed to "break out" of