List of Top CMS Security Vulnerabilities

(And How a Headless Architecture Mitigates Them)

Joel Varty
Joel Varty
Jul 1, 2021
Top CMS security Vulnerabilities

According to the US National Vulnerability Database (NVD), in 2020,103 security vulnerabilities were disclosed. This is the highest number of security vulnerabilities ever recorded and almost quadruples the number of vulnerabilities in the past decade. From these,70% provided malicious actors with an attack vector. 

This is a scary prospect for any company looking to build or maintain its digital presence as it leaves you vulnerable to all kinds of cyberattacks. While having a CMS gives you an extra layer of security, not every CMS is created equal. Traditional —or coupled CMS— like WordPress or Drupal are often even more vulnerable to attacks. In this article, we discuss the top CMS security vulnerabilities and how enlisting a headless CMS can mitigate them. 

What Is a Security Vulnerability, Anyway?

What are the Types of Cyber Security Vulnerabilities?

The NVD defines a vulnerability as “a weakness in the computational logic (e.g., code) found in software and hardware components that, when exploited, results in a negative impact to confidentiality, integrity, or availability.”

In the context of a CMS, a vulnerability occurs when a malicious actor targets a CMS platform for something other than its intended purpose.  The hacker exploits that access to compromise the CMS’ underlying infrastructure to gain access to the servers or initiate attacks against other tenants. 

How a Headless CMS prevents the top 6 Security Vulnerabilities? 

The collaborative nature of CMSs increases the number of potential attack surfaces. If you add multiple users with different notions of cybersecurity to the mix, the number of potential vulnerabilities can sharply increase. Let’s take a look at the most common CMS security vulnerabilities. 

SQL Injection

SQL injections are among the most common attacks on CMSs. SQL injection is similar to other injection attacks because it introduces arbitrary SQL code into the database layer, enabling attackers to issue direct database commands and manipulate the database as if it were the CMS user. Due to the new security measures CMSs —especially headless CMS— have implemented and the relatively easy methods to foil these attacks, they are less effective every day. Headless CMSs can mitigate these attacks to the databases by enabling you to use non-SQL databases to store and distribute your content or give you different CDN options if you want to use SQL. 

Brute-force Attacks

Brute-force attacks can be carried out by almost everyone since they involve entering multiple login credentials over a period of time until the right one is discovered. Some CMSs don’t limit the number of login attempts by default which means that users leveraging those CMSs are exposed to malicious actors who can enter hundreds or thousands of credentials until they find one that works. Even if a brute force attack fails, it can still wreak havoc on your server as too many attempts will overload and slow your system down. A headless CMS uses sign-in and authentication protocols and monitors logins with automated tools to identify login abnormalities and mitigate brute-force attacks.


Distributed denial-of-service is an enhanced version of the denial-of-service attack where a malicious actor sends a large volume of requests to a server with the purpose of making it crash or inaccessible to its intended users. DDoS attacks are often executed via many different machines —also known as botnets— which hide the origin of the requests. Modern headless CMSs render the content on the client side using APIs and reduce the load on the server each time a visitor accesses the website, reducing the impact of potential DDoS attacks.

Arbitrary Remote Code Execution

While arbitrary code injection requires more resources than other kinds of cyberattacks, injecting code into a website or app can have nefarious consequences to the users’ privacy and data. Arbitrary remote code execution makes use of any attack surface and sends a piece of PHP code to the remote execution environment which, without proper security will run as if it were from the user, opening remote backdoors for attackers to gain access to the target environment. This type of attack can compromise nonSQL databases, but headless CMS can prevent this type of attack by tightening the security rules in the hosting environment. 

Cross-Site Scripting (XSS)

This type of CMS vulnerability exploits the client environment within the browser which allows an attacker to inject arbitrary code onto the target’s instance and environment. This attack occurs on the client side, which means that it can compromise sensitive user data and allow for manipulation of the databases and stored variables. Traditional CMS platforms like Drupal and WordPress are particularly vulnerable to XSS vulnerabilities due to their heavier use of client-side environments. Headless CMSs that leverage server-side rendering mitigate potential XSS attacks. Server-side rendering protects the databases, so that if they manage to gain access to the client server, the rest of the information that wasn't queried should be safe. 

File Inclusion Exploitation

File inclusion vulnerabilities are often found in poorly coded sites. This kind of vulnerability occurs when a site allows users to input or upload files to the server and the PHP code does not  validate the input resulting in malicious files being delivered to the server. In file inclusion exploits, users can gain access to sensitive data when the servers are misconfigured or the user has high privileges. A headless CMS can mitigate this vulnerability by restricting permission to upload files to the website and keep a whitelist of allowable file types to prevent malicious files from entering into the server.

It Security vs Cyber Security

Best Practices Against CMS Vulnerabilities

  • When choosing a CMS, choose one where the vendors handle maintenance and updates, that way you will mitigate the risks of not updating. 
  • Perform regular database backups.
  • Sanitize and restrict user input to prevent injection attacks.
  • Use strong passwords and store them as encrypted values
  • Always use SSL certificates on your web server.
  • Rename admin directories something other than ‘admin’
  • Keep track of the latest vulnerabilities of your CMS.
  • Leverage two-factor authentication for an additional layer of security.
  • Scan your website using penetration testing tools.

Agility CMS: A Secure Headless CMS

agility cms security headless cms

The road to a secure website starts with you, but without the right CMS by your side, staying safe can be difficult. While you, as the user, need to implement as many of these best practices and stay aware of the top security vulnerabilities, individual security measures won’t cut it for companies looking to scale and build a solid brand presence. 

Agility CMS leverages the headless architecture to provide you with the highest level of security for your products and sites. Thanks to features like Auth0 authentication, solid CDN options, and server-side rendering, Agility CMS cooperates with you to thwart even the most determined cyberattackers. Agility CMS’ security scales with you and supports you as you build your website.

If you want to see how our enterprise-grade security works, read more here: Enterprise Grade Security.

Agility CMS  Enterprise Grade Security

  • Authentication with Auth0 
  • Backed by Microsoft Azure 
  • Auto-Scale
  • Encryption and Data storage
  • How your data is backed up
  • Message Encryption
  • Penetration tests
  • Getting access to backend data
  • Ongoing security assessments
  • Audits and monitoring
  • PCI Compliance
  • SOC2 Compliance
  • Security incident reporting

Read more:

Agility CMS: A Foundation for Better Online Security: Modern Techniques for a Secure Digital World

Agility CMS: Enterprise-grade Security

Enterprise Single Sign-On with Agility CMS

Multi-factor Authentication – Agility CMS Help Center

Best Practices for User Permissions – Agility CMS Help Center

Whitepaper Recommended for you: How Agility CMS Empowers IT, Business, and Marketing Teams Simultaneously

How Agility CMS Empowers IT, Business, and Marketing Teams Simultaneously
Back to All Articles

Our Latest Posts