7 Best Preventive Measures For SQL Injection On WordPress

June 24, 2024
7 Best Preventive Measures For SQL Injection On WordPress

Let us examine an imaginary scenario with an online store where users can access their accounts using a login page. To store important information like passwords and usernames, the website uses a SQL database. Imagine now a malicious person attempting to take pleasure in a weakness in the way the internet site receives and handles user input. How will you protect your website from hackers and attacker? What are the preventive measures for SQL injection to protect WordPress website?

The attacker modifies the login form’s input string to launch a SQL injection attack. Entering a string like “‘ OR ‘1’=’1′ -” into the field in place of a valid login and password is an ordinary method. The SQL query that is being executed has been modified by this input, leading it to consider the condition “1”=”1″ to be true. By doing this, the attacker is able to gain access without having to provide adequate login information and goes beyond the login scrutiny procedure.

Avoiding SQL injection attacks is usually the best course of action because they can have severe effects. The primary subject of this blog is preventing SQL injections. We’ll go over the various types of attacks involving SQL injection, preventive measures for SQL injection, and recommended procedures for doing so.

What Are Attacks Using SQL Injection:

A serious weakness in web security known as preventive measures for SQL injection (SQLite) allows attackers to change the queries that a program sends to its database. 

Attackers can obtain unauthorized access to confidential data that is normally inaccessible to them by taking advantage of these vulnerabilities. This includes data obtained from the database used by the application as well as data from other users of the application. Attackers have the ability to add, remove, and modify data throughout an attack, which might negatively impact the functioning or information within the application temporarily or permanently.

A serious weakness in web security known as SQL injection (SQLite) allows attackers to change the queries that a program sends to its database.

Attacks involving SQL injection are therefore a serious issue for any company. When exploitation is successful, the business’s operations, reputation, and ability to generate revenue are all inevitably harmed.

Businesses ought to concentrate on evaluating the potential loss of consumer trust resulting from the successful theft of sensitive data, such as credit card information, phone numbers, and addresses, if evaluating the impact of SQL injections.

SQL Injection Attack Types:

Because SQL injection attacks may be carried out in multiple ways on the database, cybercriminals keep favoring them. We will go over the three most prevalent kinds of these attacks so you can see how attackers try to acquire a copy of your website.

1. SQL Injections Based on Errors:

Error-based SQL injections use the relational database server’s error messages as a way to obtain details about the structure of the database. In rare circumstances, an attacker can use error-based injection of SQL techniques to list every record in a database.

To further comprehend this assault, let’s go over an example scenario:

Imagine a situation where an online application has a search function that allows users to look up products by name. Based on what the user inputs, this application creates a SQL query automatically and retrieves the related products from the database’s contents.

The code snippet that the above search function utilizes to retrieve product details from the database is as follows:

$searchTerm = $_GET[‘search’];

// Construct the SQL query

$query = “SELECT * FROM products WHERE name = ‘”. $searchTerm. “‘”;

Execute the query and retrieve the results.

$result = mysql_query($query);

It’s evident that the user’s input, stored in the variable $searchTerm, directly integrates into the SQL-generated query stored in the $query variable without undergoing the necessary parameterization and sanitization. Attackers may use this WordPress security mistake in security protocols to launch an injection attack.

If the attacker types in the search term “OR 1=1; -,” it is a typical occurrence. Therefore, the variable’s SQL query modifications as follows:

SELECT * FROM products WHERE name = ” OR 1=1; –‘

Intentionally, the injected part ‘OR 1=1; –‘ is crafted to always evaluate as true (1=1) and comment out the remaining portion of the original query (–). Instead of receiving the results for the specified search phrase, the updated query, when executed, retrieves every record from the products table.

Impact of Poor Error Handling

If the online application is improperly set up to manage and suppress database problems, this particular type of attack becomes effective. In certain situations, an attacker may receive an in-depth error message from a fake query.

Intentionally, this error message reveals details about the fundamental structure of the database. For example, the error message “Unknown column ‘password’ in ‘field list'” suggests that the PRODUCTS table contains the password column. Although they are aware that this table contains sensitive data, including user passwords, an intruder can then focus their attacks on it.

2. SQL Injection Using Unions:

Using the UNION SQL operator, union-based SQL injections merge the output of several SELECT queries into a single result set that follows up with the HTTP response.

Imagine a situation where an online application uses user input to provide product information. The software developer creates a SQL query to retrieve the pertinent details about the product from the database.

This is a brief representation of the vulnerable code:

$productID = $_GET[‘id’];

// Construct the SQL query

$query = “SELECT id, name, price FROM products WHERE id = ” . $productID;

Execute the query and retrieve the result.

$result = mysql_query($query);

This code directly combines the user’s input, stored in the variable $productID, into the SQL query without performing the required sanitization or validation. Because of this, the attacker has the chance to insert a SQL statement and queries into the process of execution.

Imagine for a moment that an attacker is aware that the PRODUCTS and USERS columns are there in the database.

They provide the following data for the parameter “id”:

One Union SELECT email, password, and username FROM the users.

This shifts the question to:

SELECT item name, ID, and price FROM id = 1 UNION WHERE SELECT users’ email, password, and username

In this particular case, the original query is concatenated with the injected component: 1 UNION SELECT password, username, and email FROM users. The purpose of this injection is to get confidential information from the USERS table, including email addresses, passwords, and usernames.

Impact of Successful Injection

The result sets will combine the outcomes from the columns in the original PRODUCTS database query with those from the inserting USERS table query when the union-based SQL injection procedure is successful. The HTTP response from the web program then contains this combined result set.

The attacker can use the sensitive data they have acquired from the reaction to further their own goals, including gaining unauthorized access to accounts held by users.

Preventive Measures

It is necessary to use secure coding techniques, such as queries with parameters or prepared statements, to stop union-based SQL injections. These methods successfully separate input from the user from the SQL query’s structure. By using these procedures, it is ensured that the input is handled only as information and never as executable code. As a result, there is less possibility of injecting queries.

3. SQL Injections Based on Boolean Blindness:

In Boolean-based SQL injection, the program’s response changes based on whether the query sent to the database returns false or true.

Imagine a web application with a login page whereby users are able to confirm their true identity by entering their username and password. After that, the application creates a SQL query that confirms the user’s identity.

This is a shorter version of the code that can be changed using Boolean-based SQL injection:

$username = $_POST[‘username’];

$password = $_POST[‘password’];

// Construct the SQL query

$query = “SELECT * FROM users WHERE username = ‘”. $username = “‘ AND password = ‘” . $password = “‘”;

Execute the query and check the result.

$result = mysql_query($query);

As you observe, there is no prior sanitization or validation involved in the concatenation of user input into the query generated by SQL for the password and username fields. The attackers can therefore use this input to insert a SQL query on a boolean basis.

An attacker might enter the following, for example, in the username field:

‘ OR 1=1 –

The updated query would now look like this:

SELECT * FROM users WITH password = “<user-provided-password>” AND username = “OR 1=1 -“

This part of the injection is especially made for changing the query, and as a result, it always returns TRUE.

The injected part “OR 1=1” in this instance serves as a requirement that always evaluates to TRUE. To prevent the injected code from causing semantic issues, developers use the double dash (–) to comment out the remaining portion of the original query.

Detection and Consequences

A software program may return an appropriate authentication response if the SQL injection query responds to TRUE, giving the attacker unauthorized access to the stem. Conversely, in the unlikely scenario that the query responds to FALSE, the program may deny access or issue an error message.

The attacker can determine if the injection was successful or unsuccessful by looking at these two reactions. In the event that the attack is successful, the attacker can then move on to further exploit the vulnerability by altering the injected code or obtaining private data.

Preventive Measures

Safeguarding the application against Boolean-based SQL injection involves two methods: utilizing queries with parameters and employing input sanitization. These procedures prevent the injection of dangerous code by maintaining a separation between user input and the structure of the SQL query. In addition, putting strong validation of input and sanitization procedures in place helps preserve the overall accuracy of data provided by users.

How to preventive measures for SQL injection Attacks in Seven Stages:

Web application developers typically must ensure implementing input filtering, restrict database access, and maintain continuous monitoring of both the program and database. While these methods are effective, they are most beneficial during the development stage as reviewing updated code line by line can become overwhelming due to their scale.

If that describes you, there are an assortment of commercial and open-source tools available to help development teams find SQLite problems. These tools are well compatible with premium WordPress themes.

1. Implement input filtering strictly:

Input filtering methods are an essential strategy for countering preventive measures for SQL injection attacks.

This extensive list of methods addresses user input validation and sanitization prior to preprocessing and SQL query execution. Developers can ensure they don’t treat user-supplied information as executable query code by employing effective input filtering strategies like using queries with parameters and prepared assertions. This significantly reduces the potential vulnerabilities stemming from preventive measures for SQL injection.

2. Put whitelisting and strong input validation into practice:

To prevent SQL injection attacks, programmers should use both input filtering and equally strong input validation. In order to make certain that user inputs follow their intended format and fall inside the expected “safe” range, programmers should set up various validation tests.

Because input whitelisting restricts input to authorized characters and patterns, it can be especially effective. Any potentially hazardous input that differs from the stated safe criteria is essentially rejected by this validation procedure.

3. Database Code Restriction:

Limiting the database code itself is a basic preventative approach.

This is another extensive list of code-level precautions, like not creating SQL queries dynamically by joining user inputs with the search query string. Instead, in order to reduce the number of cases of unauthorized SQL code tampering, developers ought to concentrate on designing stored procedures and parameterized queries.

4. Limit database access:

Preventing the use of SQL injection attacks requires strict management of database access. The least privilege concept should be followed by developers. They should make certain database users have the minimal amount of permissions needed to carry out their intended responsibilities. Developers may decrease the danger of unauthorized SQL injections by limiting database utilization to authorized users through the use of strong authentication and authorization procedures.

5. Regular Database and Application Maintenance:

To protect against SQL injection attacks, applications and databases must be maintained consistently. Applying security patches and updates on time to databases, frameworks, and libraries is part of the maintenance process. Antiquated software components may have renowned vulnerabilities that can be readily accessed by adversaries. By updating all software parts, developers may drastically reduce the possibility of SQL injection vulnerabilities.

6. Permanent monitoring of the database along with application input communications:

A vital aspect of preventive measures for SQL injection attacks is monitoring.

By closely observing application inputs and network communications, developers can spot odd or suspect behavior that could point to a running SQL injection attack. In order to identify and prevent SQL injection attempts as soon as possible in (near) real-time, we advise putting up intrusion prevention and detection systems as well as recording and examining database requests.

7. Web Application Firewalls (WAFs):

The application can be effectively protected against SQL injection attacks by deploying a web application firewall (WAF). A WAF sits somewhere between the application’s server and customers, examining requests that arrive to identify and reject those that seem suspicious and malicious. WAFs can identify and prevent SQL injection attempts, enhancing overall application defense by inspecting the request payload and implementing predefined security rules and patterns.

Use site-level procedures and the best applications to preventive measures for SQL injection:

Attacks involving SQL injection are a severe security risk that could harm the reputation and financial success of your company.

The good thing is that you can organize your safety precautions more effectively by following a number of servers and application-level standards.

First, let’s address the application-level measures.

1. Application Level Best Practices:

Attacks using preventive measures for SQL injection are implemented at the program level. It therefore makes sense to implement the following application-level suggested practices for SQL injection protection:

2. Validation and Sanitization of Input:

To prevent attacks through injection, user input must be authenticated and sanitized on the application side. This entails comparing the input to predetermined standards, like expected formats, length limitations, and data kinds.

You can make sure that input complies with the necessary limitations by verifying it. To prevent potentially dangerous characters from being interpreted as executable code, sanitization involves removing or escaping them from the input.

3. Prepared Statements and Parameterized Queries:

Prepared statements, referred to as parameterized queries, offer a strong defense against SQL injection threats.

Pre-compiled SQL commands utilize placeholders for values in prepared statements, ensuring input variables are securely treated as data rather than executable code. By using this method, attackers are unable to insert detrimental SQL code into the database query.

4. Stored Procedures:

Predefined SQL code is saved in a database as stored procedures. Injection attempt risk is decreased when stored procedures contain SQL logic.

Rather than creating queries dynamically within the application’s code, you invoke the relevant stored procedure, providing only the necessary data. By preventing direct database communication, this strategy reduces the attack area and encourages code reuse and reliability.

5. Utilize ORM libraries:

Libraries for ORM (Object-Relational Mapping) offer an abstraction-level interface for working with databases. These packages make safe database operations easier by removing the SQL code. Query building and parameter binding are typical functions of ORM systems, and they naturally guard against SQL-injection attacks. When creating SQL queries, the ORM takes care of making certain that the values of the input are appropriately bound and escaped to safeguard them against injection issues.

6. Always remember the principle of least privilege:

Always keep the least privileges principle in mind while arranging permissions and access rights for database user accounts. The least number of privileges needed by every user to carry out the assigned job should be granted.

By restricting access, you can lessen the potential harm that an injection attack could cause. To make sure that user privileges are in line with the requirements of the program, we suggest carrying out periodic audits and upgrades. Keep in mind that you can cancel any unnecessary rights during the review procedure.

7. Apply secure coding practices:

Injection attack prevention is greatly helped by secure coding practices. It is important to teach developers the best practices and fundamentals for safe coding. This entails putting secure data management, output encoding, and input validation into practice. In order to significantly reduce the danger of injection vulnerabilities, users can also incorporate other practices, including employing queries with parameters, avoiding dynamic SQL creation, and utilizing safe coding items and frameworks.

8. Handling errors and error notifications:

Properly managing error control is essential to prevent the disclosure of data that could assist attackers in refining their strategy.

Error messages ought to be general and should stay away from revealing private information about a database or application. Users shouldn’t receive detailed error messages instantly since they can reveal important information about the design of the programs and their security holes.

Instead, log extensive error information for troubleshooting while supplying users with error messages that are easy to understand.

9. Site-Level Practices:

We strongly advise adopting site-wide best practices, which strengthen website security and guarantee defense against a variety of threats, alongside application-level best practices.

10. Put the right configuration first:

Site-level security depends on the security of your database server, which is the application server, and the web server setup. Adhere to the security best practices that suppliers advise you to do, such as locking down administrative interfaces, turning off unneeded services, and turning on encryption—HTTPS in particular—to protect data while it’s in transit. To keep the environment safe, examine and modify the server configurations on a regular basis.

11. Web Application Firewalls (WAFs):

WAFs, or web application firewalls, offer extra defense against injection attacks. WAFs examine incoming as well as outgoing traffic while positioned between the app and the network. They conduct real-time analysis of HTTP requests and responses to identify and prevent suspicious requests potentially containing SQL injection payloads. WAFs can be configured to recognize and prevent various injection attacks using established standards and heuristics.

12. Patching and regular updates:

Crucially, updating database administration systems, libraries, and application frameworks is essential for addressing publicly disclosed vulnerabilities. Vendors regularly issue security updates and patches that address vulnerabilities, especially injection attack-related ones.

13. Access Controls:

Put in place robust authentication procedures on the database and application servers. Implement strict authentication measures, like multi-factor authentication, powerful password creation, and safe password storage. Assign users access permissions and rights in accordance with the least privilege concept, giving them only the minimal authority required to complete their jobs. To make sure that user identities and privileges correspond with the required privilege levels of difficulty, review and audit them.

14. Schedule Procedures for Security Testing:

To find and fix problems in the application’s code and database configuration, regular testing for safety is essential. Code reviews, penetration testing, and scanning for vulnerabilities are some of these procedures.

Although penetration testing mimics actual attacks to find possible injection flaws, scanning for vulnerabilities is a common security concern. Static code analysis techniques and routine code reviews aid in locating errors in code that may result in injection vulnerabilities.

15. Monitoring and auditing digital databases:

Turn on the monitoring and auditing functions that come with your database administration system. These functions log and monitor operations in the database, including query runs, login attempts, and patterns of access. Examine and evaluate the database logs on an ongoing basis to look for any indications of suspicious activities and attempts at injection attacks. By using proactive tracking, you’re able to quickly recognize and deal with possible security incidents.

16. Backup and recovery:

Put into practice a reliable backup and recovery plan for your SQL databases. By regularly backing up the databases, you may be sure that in the event of a successful insertion attack, data corruption, or system failure, you have current archives to utilize for database restoration.

It is essential to maintain the security of backups by carrying out regular tests to verify the efficacy of the restoration process. Backups offer a safeguard for restoring data and lessen the effects of intrusions and instances of data loss.


To keep SQL databases secure and intact, SQL injection protection is essential. You can choose to use a number of efficient techniques to stop SQL injection attacks by being aware of the strategies and dangers related to these assaults. Incorporating best practices such as input validation, parameterized query syntax, secure coding, and frequent security testing at both the program and website levels significantly reduces the risk of injection attacks. Popular WordPress themes often incorporate robust security practices, helping to fortify your website’s resilience against potential vulnerabilities, including SQL injection attacks. Or you can go for WordPress theme bundle to which can provide endurance in the presence of possible hazards.

RedSwitches, a reputable web host and equipment supplier, enhances protection by providing a secure hosting environment, implementing network safety measures, conducting frequent updates, ensuring DDoS reduction, offering disaster recovery and backup solutions, and more.


1. Why is preventive measures for SQL injection critical:

Unauthorized access, breaches of data, manipulation of information, and other security issues can result from SQL injection attacks. The safety and reliability of databases depend heavily on the use of SQL injection protection techniques. These safeguards protect sensitive data, stop data loss and corruption, and guarantee that apps operate correctly.

2. Which application-level best practices are there for avoiding SQL injection:

To ensure that only legitimate data enters the system, application-level SQL injection prevention techniques involve implementing input validation through queries with parameters or prepared statements. To handle user input safely, you should think about putting secure coding practices in place. You should also do testing for security and code reviews on an ongoing basis to find and address issues.