The phrase you provided, -9718 UNION ALL SELECT 34,34,34,34,34,34,34,34,34,34# , is a classic example of , a technique used to probe a database for vulnerabilities. Understanding the Syntax
: This SQL operator combines the result sets of two or more SELECT statements into a single result. -9718 UNION ALL SELECT 34,34,34,34,34,34,34,34,34,34#
: This likely represents a dummy or non-existent ID. By using an ID that doesn't exist, the attacker ensures the first part of the query returns no results, making the "injected" results from the second part more visible. The phrase you provided, -9718 UNION ALL SELECT
: Filter and sanitize all user-provided data to block unexpected characters like UNION , SELECT , or # . By using an ID that doesn't exist, the
: In many SQL dialects like MySQL, the hash symbol indicates the start of a comment, which "comments out" the rest of the original, legitimate query so it doesn't cause a syntax error. Security Implications
: This ensures the database treats the input as literal data rather than executable code.
This specific string is designed to trick a web application into running an unintended database command: