SQL Injection is a vulnerability where an attacker interferes with the queries an application makes to its database. The payload "-5025 ORDER BY 1#" is an "Inference" or "Error-based" probe used to determine the structure of a database table without having direct access to the source code.
The number 1 refers to the first column in the SELECT statement. -5025 ORDER BY 1#
This is the terminator . It attempts to break out of the developer's intended string literal. If the application does not sanitize input, the database engine will see this quote and assume the original command has ended, allowing the attacker to append their own logic. SQL Injection is a vulnerability where an attacker