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Best practices for preventing SQL injection attacks

icon Posted by: Praveen Joshi
icon January 27, 2023

In Brief

What is SQL Injection?

This is a type of attack that aims to exploit vulnerabilities in a web application’s database by injecting malicious SQL code. This is done by manipulating input fields on the web page, such as a login form, to send the malicious code to the database. Once the code is executed, an attacker can gain access to sensitive data, such as user login credentials, personal information, or even financial data. They can also use this access to manipulate the data stored in the database, such as altering or deleting records. SQL attacks are one of the most common types of attacks on web applications because they can be relatively easy to execute, and the consequences can be severe. These attacks can be carried out by exploiting various types of SQL injection vulnerabilities, such as unvalidated input vulnerabilities, authentication bypass vulnerabilities, and privilege escalation vulnerabilities.


of websites are prone to injection attacks.


of all cyberattacks against web applications are initiated through script or query injections.


of websites owned by educational institutions have an SQLi vulnerability.


of organizations across all industries were vulnerable to SQL attacks last year.

Best Practices to Prevent SQL Injection

To prevent these attacks, web developers should ensure that input validation is properly implemented and that all user input is sanitized before it is passed to the database. Additionally, using prepared statements and parameterized queries can also help to protect against SQL injection attacks by ensuring that user input is treated as data, rather than as code.

Preventing injection attacks is a critical aspect of web application security. Here are several best practices that can be used to prevent SQL injection attacks:

1. Input validation: One of the most effective ways to prevent SQL attacks is to ensure that all user input is properly validated before it is processed by the web application. This can be done by using a whitelist approach, where only specific input values are allowed, rather than a blacklist approach where specific input values are prohibited.

2. Use of prepared statements: Prepared statements and parameterized queries can help to protect against SQL attacks by ensuring that user input is treated as data, rather than as code. This can be done by using placeholders in SQL statements and then binding the user input to the placeholders.

3. Use of Object-Relational Mapping (ORM) libraries: ORM libraries can also help to prevent SQL injection attacks by automatically parameterizing user input and protecting against injection.

4. Escaping characters: Use of functions like MySQL real escape string or PDO quote to escape characters in user input that has a special meaning in SQL.

5. Least privilege principle: Grant the minimum privilege required for the user to perform the task. This will ensure that even if an attacker is able to gain access to the system, they will not be able to perform malicious actions.

6. Regularly test and monitor: Regularly test your web application for injection vulnerabilities using both automated and manual testing methods, and monitor the application logs to detect and respond to any suspicious activity.

7. Use of security tools: Use security tools like firewalls, intrusion detection systems, and web application firewalls to detect and block injection attacks.

8. Keep software up to date: Keep all software and frameworks used in your web application up to date to ensure that any known vulnerabilities are patched.

9. Employee Training: Regularly educate your employees about SQL injection attacks, the importance of input validation, and using prepared statements in their day-to-day work.

By following these best practices, organizations can significantly reduce the risk of an injection attack and ensure that their web applications are as secure as possible. However, it’s important to note that security is an ongoing process and it’s important to keep up with the latest threats and attack techniques to ensure that the application stays secure.

Before You Go

  • SQL injection is certainly among the most used attack method by cybercriminals to compromise web applications.
  • Deploying expert cyber security solution only is not enough. You need to follow the best practices for complete web application security.


  • Cyber Security Solutions
  • sql injection
  • Web application security

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