SQL Injection Masterclass

"To build a fortress, you must first understand the siege."

Educational Purpose Only

This course is designed for defensive security training. All techniques should only be practiced in authorized environments (like the simulator below).

What is SQL Injection (SQLi)?

The art of subverting database queries.

SQL Injection occurs when untrusted user input is concatenated directly into a database query without proper sanitization or parameterization. This allows an attacker to manipulate the query's structure, potentially accessing, modifying, or deleting data they shouldn't see.

// Vulnerable Code

query = "SELECT * FROM users WHERE name = '" + userInput + "'";

If the user inputs ' OR '1'='1, the query becomes:

SELECT * FROM users WHERE name = '' OR '1'='1'

Since '1'='1' is always true, the database returns all users instead of just one.