The input {KEYWORD}) UNION ALL SELECT NULL,NULL# is a classic payload. This specific string is designed to break out of a developer-defined query and append a UNION statement, allowing an attacker to retrieve data from other tables or probe the database structure [1]. 2. Technical Analysis
Sanitize inputs to block special characters like ) , # , and -- . {KEYWORD}) UNION ALL SELECT NULL,NULL#
Identify the database version and schema to plan a larger breach [1]. 4. Recommended Fixes The input {KEYWORD}) UNION ALL SELECT NULL,NULL# is
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: {KEYWORD}) UNION ALL SELECT NULL,NULL#
Force a "True" result to log in without a password.