Modern web frameworks now use "Parameterized Queries," which treat user input as harmless text rather than executable code. However, SQLi remains one of the top vulnerabilities on the OWASP Top 10 list because, even 25 years later, it only takes one unsterilized input field to open the door.
The core of your query—the ' (single quote)—is the most famous character in cybersecurity. In SQL, it’s used to wrap text. By adding your own quote, you effectively "break out" of the text box the programmer built and start typing commands directly to the database server. 2. The UNION ALL Trick Modern web frameworks now use "Parameterized Queries," which
Your specific string uses UNION ALL . This is a clever way to stitch two different data tables together. By selecting NULL values, an attacker can probe a database to see how many columns a table has without causing a crash. It’s like feeling around a dark room to find where the furniture is before trying to steal the TV. 3. The "Hidden" Tables In SQL, it’s used to wrap text