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Another WordPress Form Plugin Vulnerability: This Time It’s Worse

Another WordPress Form Plugin Vulnerability: This Time It’s Worse

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Plugin Vulnerability

Preventing security holes before they happen is of the utmost importance in the field of website protection. The popular MW WP Form plugin has a critical security hole that affects versions 5.0.1 and earlier, according to security researchers at Wordfence. There is a serious threat to vulnerable websites due to this vulnerability, which has a rating of 9.8 out of 10. In this article, we will explore this vulnerability in detail, discussing its possible impact and the steps to take to reduce the risk.

Learning How to Use the MW WP Forms Plugin

One popular tool for making forms on WordPress sites is the MW WP Form plugin. Its shortcode builder makes it simple to make and modify forms with a wide range of fields and settings. One of the numerous features of the plugin is the ability to collect data through file uploads using the [mwform_file name=”file”] shortcode. Sadly, this is the exact quality that can be taken advantage of.

A Security Risk in Unauthorized File Uploads

Hackers can upload malicious files to a website without the user’s permission due to a critical security flaw called an unauthenticated arbitrary file upload vulnerability. By exploiting this flaw in the MW WP Form plugin, malicious actors could potentially execute remote code on the server by uploading arbitrary files, including harmful PHP backdoors. The plugin’s file type check function does not work as intended, which makes this threat even more severe.

If a file type that isn’t allowed is uploaded, the file type check function will throw a runtime exception, but the function will still execute and upload the file anyway, according to Wordfence’s security researchers. This ensures that files can still be uploaded despite the detection of potentially harmful file types; the only action taken is to log the detection. As a result, malicious actors can gain remote code execution by uploading and running any PHP file on the server.

Attack Success Requirements

This vulnerability is considered critical, but an attack can only succeed under certain circumstances. Turn on the setting for “Saving inquiry data in database” in the form’s settings. Users who have chosen not to enable this option will not be impacted by this safety risk. On the other hand, you need to move quickly to secure your website.

What to Do: Apply Patches and Updates

It is crucial to update the MW WP Form plugin to version 5.0.2 in order to safeguard your website from this critical vulnerability. This update fixes the vulnerability and makes it less likely that remote code execution will occur. Your website and its visitors could be at risk from possible attacks if you don’t update the plugin.

Users of Wordfence’s MW WP Form plugin are strongly encouraged to update to the latest version immediately. For users who have enabled the “Saving inquiry data in database” option in the form settings, this advice is particularly critical. Your website’s safety and integrity can be guaranteed by promptly updating the plugin.

Why Website Security is Crucial

Website security is crucial, and this vulnerability highlights that. Website owners must be extra careful and proactive to safeguard their online assets from the ever-evolving cyber threats. To keep ahead of potential security holes, it is essential to update WordPress core, plugins, and themes on a regular basis.

To further improve your website’s security, it is important to use strong passwords, trustworthy security plugins, and frequent backups. Additionally, make sure your software is up-to-date. You can lessen the likelihood of being a cyber attack victim by implementing a thorough security plan.

See first source: Search Engine Journal


Q1: What is the security issue with the MW WP Form plugin?

A1: The MW WP Form plugin for WordPress has a critical security hole in versions 5.0.1 and earlier, identified as an unauthenticated arbitrary file upload vulnerability with a severity rating of 9.8 out of 10.

Q2: How does the MW WP Form plugin work?

A2: The MW WP Form plugin is used to create forms on WordPress sites, featuring a shortcode builder for easy form creation and modification, including options for file uploads.

Q3: What is the vulnerability in the MW WP Form plugin?

A3: The vulnerability allows hackers to upload malicious files without user permission. The plugin’s file type check function fails to prevent unauthorized file uploads, enabling attackers to execute harmful PHP backdoors.

Q4: What is the critical flaw in the plugin’s file type check function?

A4: The file type check function incorrectly uploads files even if they are of a disallowed type. It logs the detection of harmful file types but still proceeds with the upload, allowing remote code execution on the server.

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Q5: Under what conditions can the vulnerability be exploited?

A5: The vulnerability can be exploited if the “Saving inquiry data in database” option is enabled in the form’s settings. Websites not using this feature are not at risk.

Q6: What should users of the MW WP Form plugin do?

A6: Users should update the plugin to version 5.0.2 immediately. This version patches the vulnerability and reduces the risk of remote code execution.

Q7: Why is it urgent to update the plugin?

A7: Without updating, websites using the vulnerable version of the MW WP Form plugin are at risk of malicious attacks that could compromise the website’s security and integrity.

Q8: What general steps can be taken to enhance website security?

A8: Regularly updating WordPress core, plugins, and themes, using strong passwords, employing reliable security plugins, and performing frequent backups are key to improving website security.

Q9: Who should be particularly concerned about this vulnerability?

A9: Website owners using the MW WP Form plugin, especially those who have enabled the “Saving inquiry data in database” option, should be particularly vigilant.

Q10: How significant is website security in the current digital landscape?

A10: Website security is extremely important, as vulnerabilities like this one highlight the constant threat of cyber attacks. Being proactive and vigilant in security measures is essential for protecting online assets.

Featured Image Credit: Photo by Miles Burke; Unsplash – Thank you!

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