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The Most Common Web Security Vulnerabilities (And How To Prevent Them)

Web security is crucial to maintaining a safe and secure online environment. Unfortunately, a variety of common vulnerabilities can put your website at risk. 

This post will look at some of the most common web security vulnerabilities and discuss ways to prevent them.

Injection Flaws

Injection vulnerabilities arise when untrusted data is provided as part of a command or query to an interpreter. This hostile data can lead to the unintentional execution of commands or unauthorized access to data. Common injection flaws include SQL, LDAP, XML, and command line interfaces (CLI). For more information, reach out to CanSpace. 

In order to prevent injection flaws, it is recommended to use prepared SQL statements—or parameterized queries. This ensures that form submissions do not contain malicious code, which could potentially exploit vulnerabilities. 

To further reduce the risk of injection attacks, user privileges should be restricted, and input validation should be implemented. Moreover, software and databases should be regularly updated with the latest security patches to minimize potential vulnerabilities.

Cross-Site Scripting (XSS)

Cross-site scripting (XSS) is one of the most common web security vulnerabilities and the easiest to exploit. It occurs when an attacker injects malicious code into a web page, allowing them to steal sensitive information or take control of the user’s browser. 

The injected script can make requests to other websites or servers and steal sensitive information from their database. It can also steal cookies from that site and send them back to the attacker, so they can use them for future attacks on other websites that use the same cookies.

To prevent XSS, it’s important to validate and sanitize user input and use the Content Security Policy (CSP) to restrict the types of scripts executed on a webpage.

Cross-Site Request Forgery (CSRF)

Cross-site request forgery (CSRF) is a web security vulnerability that allows attackers to make requests on behalf of a user without their knowledge or consent. It happens when an individual visits a website controlled by an attacker, unaware that the website is executing actions on an application vulnerable to CSRF. 

This attack requires knowledge about how a particular web application functions but does not require any special hacking skills or resources, such as malware or botnets, making it one of the most common types of cyberattacks today.

CSRF attacks are typically prevented by using CSRF tokens, which will validate any actions from the server with a particular token. This token will also have an expiration date.


Clickjacking is a type of malicious attack that tricks a user into clicking on a button or link on an apparently legitimate website. This can allow the attacker to steal sensitive information or perform other malicious actions.

Clickjacking exploits weaknesses in web browsers and common web application design practices. To prevent this, make sure you are only visiting reputable sites. Also, ensure your browser has up-to-date security patches.

Insecure Session Management

Insecure session management happens when an attacker is able to take over a user’s session, allowing them to steal sensitive information or perform other malicious actions. In some cases, the attacker can steal the victim’s session identifier (a unique number that a web server assigns to a user during their visit) and use it to gain access to their account.

To prevent this from happening, you can implement session tokens or cookies in your web application. A cookie will notify the server when someone is authenticated, so they’re not required to re-authenticate themselves whenever they visit another page on your site. 

Insecure Communication

Insecure communication occurs when an attacker intercepts or tampers with communications between a user and a website. Data is commonly transferred between server and client/user, and unencrypted connections allow attackers to steal sensitive data. 

To prevent insecure communication, it’s essential to validate SSL/TLS/HTTPS certificates on the server side, avoid mixed SSL/HTTPS sessions (using third-party SSL/HTTPS versions when dealing with outside entities), and apply a separate layer of encryption to sensitive data before it passes through the SSL/HTTPS channel. 

Looking for industry-leading domain or web hosting services in Canada? With CanSpace, you don’t just choose high-quality service; you choose security and peace of mind. To get started, contact us online today.

CanSpace Team

CanSpace Solutions is Canada's leading domain name registrar and web hosting provider. Keep an eye on our blog for expert information on domain names, websites, and running a business online.