{keyword}) Union All Select Null,null# -

The # character (used in MySQL/MariaDB) comments out the rest of the legitimate query, preventing syntax errors from trailing code [3]. 3. Potential Risk An attacker successfully using this technique can:

UNION ALL SELECT NULL,NULL is used to determine the number of columns in the original query's SELECT statement. If the page loads without an error, the attacker knows the original table has exactly two columns [2]. {KEYWORD}) UNION ALL SELECT NULL,NULL#

The ) and } characters attempt to close existing function calls or brackets in the original SQL statement. The # character (used in MySQL/MariaDB) comments out

Sanitize inputs to block special characters like ) , # , and -- . and -- .