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

: Instead of building query strings with user input, use placeholders ( ? ). This ensures the database treats input as literal text, not executable code.

: A random string (cache-buster or signature) often used by automated scanning tools like SQLmap to track the success of a specific injection attempt. ⚠️ Security Implications : Instead of building query strings with user

: Attackers can replace the NULL values with table names (like users or passwords ) to steal the entire database. : A random string (cache-buster or signature) often

: In some configurations, attackers can run commands to delete tables or modify sensitive financial records. ✅ How to Prevent This ✅ How to Prevent This : These are placeholders

: 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.