It looks like you’ve shared a string of code. This specific pattern is often used by automated security scanners or malicious actors to test if a website's database is vulnerable to unauthorized data extraction. What is this code?

If this code is entered into a search bar, login field, or URL and successfully executes, it means an attacker could potentially download your entire user database, including passwords and personal information. How to protect your website

If you are seeing this in your website logs, it’s a sign that someone (or a bot) is scanning your site for weaknesses.

Never trust user input. Use "allow-lists" to ensure only expected formats (like numbers or plain text) are accepted.

by joining the results of the original (intended) query with a custom query.

Ensure the database user account used by your application only has the permissions it absolutely needs.

A WAF can help detect and block common SQL injection patterns before they reach your server.