-1740) Union All Select 34,34,34# -

This is a comment character in MySQL used to nullify the rest of the original, legitimate query, preventing syntax errors [2, 5].

This string is a classic payload designed to test for vulnerabilities in a database [1, 2]. Specifically, it uses a UNION ALL SELECT statement to attempt to append "junk" data (the number 34) to the results of an existing query [3]. Security Incident Report: SQL Injection Probe 1. Incident Overview -1740) UNION ALL SELECT 34,34,34#

An attempted SQL Injection attack was identified in the subject field of an incoming request. Payload: -1740) UNION ALL SELECT 34,34,34# This is a comment character in MySQL used

Ensure your WAF is configured to flag and block common UNION SELECT patterns [9]. AI responses may include mistakes. Learn more Security Incident Report: SQL Injection Probe 1

Attackers use repeating constants like this to determine the number of columns in the original table [3]. If the page loads without an error, they know the table has exactly three columns.

This tells the database to combine the results of the original query with a new query created by the attacker [3, 4].