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

: Rejecting any input that contains SQL keywords like UNION , SELECT , or comments ( -- ).

: This is a SQL comment symbol. It tells the database to ignore everything that follows it, effectively neutralizing the rest of the original, legitimate code.

: Using parameterized queries ensures the database treats input as literal text, never as executable code.

: This is likely a "fingerprint" or a unique string used by automated scanning tools (like SQLmap) to identify if the injected code was successfully processed. The "Essay" of a Vulnerability