Cross-site scripting flaw in WordPress plugin Ninja form.

The Cross-site scripting attack on WordPress site:

Internet traffic is on the rise rapidly. Users like things that require less effort, and with quality work, WordPress is part of this.WordPress introduced in 2003, and there are millions of Wordpress websites hosted until now. Since we know that WordPress is a fixed website building block, each site has its purpose, and we are always trying to make it distinct from other websites not just by content but by structure. We've tried a lot of themes or plugins to attach additional functionality to WordPress-based sites, but are you sure the plugin is secure for your website or not vulnerable? Security is a vital part of website development, whether in terms of content, ads, and even up to user requirements or SEO, you can make your website the best. miniOrange investigates the behavior of requests and blocks the harmful IP before it reaches your site.

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The vulnerabilities in WordPress site enables attackers to inject malicious scripts under the impression of a trustworthy individual and force the user to perform malicious activities. There is no way to verify that the script is coming from a trusted source or not. In WordPress, we may attach additional functionality to WordPress sites through plugins, but often excellent services do have some drawbacks. After plugin activation, not only does the plugin grab the website parameters, but it also adds its input fields in it, and the chances of vulnerability in these input fields are often possible. That list of input fields contains site search, comment form, contact form, login pages, etc. The real security measure is based on these input fields because hackers exploit vulnerabilities in input fields and add malicious code to the site.

How an XSS attack impacts a WordPress site?

The attacker injects malicious script, which mainly contains malicious links or some malicious programs that silently get installed into the system without user interaction. Sometimes it forces the user to provide additional information. As we know, we don’t need to log in again, and again, once we login to web application, it generates a cookie session, and we can able to access web application until the session gets expired. After the cookies get stolen, the intruder will able to reach the user account without a username & password and able to view all the applications that opened in the same browser.

There are three types of XSS:

  • The Reflective cross-site scripting attack is where the malicious script is injected from the client-side.

  • The persistent cross-site scripting attack is where the malicious script that is inserted by an attacker gets stored in the database, allowing the attacker to possibly retrieve information stored within the database.

    Reflective-xss WordPress-plugin-ninja-form
  • The Dom cross-site scripting is a client-side attack. The malicious script directly executed after the execution of a legal server script.

    Non-persist WordPress-plugin-ninja-form

The miniOrange framework focuses on "what is necessary?". Our team members evaluate those requirements and make products that satisfy the needs of the customer. For this, we have a tester team that is working 24 hours to provide you with the most robust security solution.

The XSS vulnerability in the “Ninja form 3.3.17” plugin:

miniOrange founds a DOM XSS flaw in a plugin called the Ninja form (3.3.17) having 1+ million active installations. This plugin is famous for the creation and customization of form designs. There are lots of reasons "Why a WordPress site may get hacked? ". One of them is the regular feature update on a WordPress platform. If we skip any update, it produces a penetrable whole that encourages an attacker to reach the web. The XSS is all about injecting malicious code, and it also occurs via URL. The attacker enters by inserting the malicious script to steal user information when they have signed in and target their browser. In the Ninja form plugin, the vulnerability can be exploited by sending the following request to the form_id parameter of admin-ajax.php and edit.php.

ninja-form stores xssurl1

ninja-form stores xss url2

ninja-form stores url3

ninja-form stores cross scripting

How to protect your WordPress site from Attackers?

miniOrange provides a security package for your WordPress site. In it, you can get a Web application firewall to get rid of malicious activities.

The miniOrange provides firewall based on two levels:

  • Website firewall based on plugin level:

    This will activate WAF after the WordPress load. This will block illegitimate requests after making a connection to WordPress. This will check Every Request in the plugin itself.


  • Website firewall on .htaccess level:

    At this level, WAF gets activated before the WordPress load. This level block illegitimate requests before any connection to WordPress. The illegal requests are gets blocked before any page gets loaded at this level.


The firewall service gets enabled on plugin activation. In the free version of WP Security Pro, you get some signatures to prevent your WordPress site from cross-site scripting (XSS).


WAF filters and blocks unauthorized requests which are coming from a web application and do not allow abuse of it.


Further Details:
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