Behind virtually every modern website lies a database: containing customer data, product information, passwords, or orders. SQL injection is an attack technique that targets precisely that database and has been one of the most common ways websites are hacked for years. In this article, we explain what it is, why it poses such a risk, and, most importantly, how to protect yourself against it.

What is SQL injection?

SQL (Structured Query Language) is the language that websites use to communicate with their database, for example, to retrieve user credentials when logging in. SQL injection is a technique in which an attacker inserts malicious SQL code via a website's input field, such as a search bar, login form, or contact form.

When a website does not properly verify user input before processing it, that entered code can be unintentionally executed by the database. In this way, an attacker can view, modify, or even delete data without permission.

Why is SQL injection so dangerous?

Access to sensitive data A successful SQL injection can provide access to customer data, passwords, payment details, or other confidential information.

Data manipulation Attackers can not only read data, but also modify or delete it, with all the consequences this entails for the functioning of a website.

Reputational damage A data breach caused by SQL injection can severely damage customer trust and often also entails legal obligations, such as reporting the breach in accordance with GDPR regulations.

Widespread risk Because SQL injection has been known for a long time, automated tools constantly search automatically for vulnerable websites. Therefore, smaller websites are also at risk.

How do you recognize a vulnerable website?

As a website owner, you don't simply spot an SQL injection with the naked eye. The risk lies in how the website is built behind the scenes: does the code process user input securely, or is that input sent directly to the database? That is something your developer or hosting provider needs to keep an eye on.

How do you protect your website against SQL injection?

Prepared statements and parameterized queries The most important technical protection is that developers never place user input directly into a database query, but use so-called prepared statements. In this way, input is always treated as data, never as executable code.

Input Validation: Every form of user input, from search fields to forms, must be checked and filtered before it is processed.

Current software Outdated CMS versions, plugins, or frameworks often contain known vulnerabilities. Regular updates are therefore essential.

A Web Application Firewall (WAF) A WAF can recognize and block suspicious patterns in incoming traffic before they reach the website or database.

Minimal access rights Database users should never have more rights than strictly necessary. This limits the damage, even if an attack were to partially succeed.

The role of your hosting provider

Mediawax helps mitigate the risk by keeping servers up to date, providing malware and attack detection, and deploying a firewall that filters suspicious traffic. However, the responsibility for secure code remains largely with the website or CMS itself.

Conclusion

SQL injection remains one of the most common and risky forms of website hacking, despite the technique having been known for years. The right combination of secure code, up-to-date software, and server security makes the difference between a vulnerable and a well-secured website. Are you unsure about the security of your current website? At Mediawax, we help you think about security, both at the server level and beyond.

This article is intended to make website owners aware of this type of vulnerability, not as a manual for carrying out attacks.