It’s crucial for website administrators and developers to stay informed about potential security risks. Today, we’re shedding light on a critical vulnerability found in the popular RegistrationMagic plugin for WordPress, identified as CVE-2017-20208. This flaw could have serious consequences for affected websites.
At its core, this vulnerability is a type of PHP Object Injection. In simple terms, a web application sometimes needs to take structured data from outside sources (like user input) and convert it back into a usable format for its internal processes. This process is called deserialization. When an application deserializes untrusted data without proper checks, a clever attacker can sneak in malicious code disguised as legitimate data. For the RegistrationMagic plugin, this meant that an unauthenticated attacker could inject a specially crafted PHP Object. With the additional presence of a “POP chain” (Property Oriented Programming chain), attackers could even fetch a remote file and install it directly onto the vulnerable WordPress site. This type of exploit is highly dangerous, giving attackers significant control over your website.
CVE Details
- Product: RegistrationMagic – Custom Registration Forms, User Registration, Payment, and User Login plugin for WordPress
- CVE ID: CVE-2017-20208
- Published Date: October 18, 2025
- Severity: CRITICAL
- Status: Analyzed
Affected Products
This critical vulnerability impacts all versions of the RegistrationMagic – Custom Registration Forms, User Registration, Payment, and User Login plugin for WordPress released before version 3.7.9.3. If your website is currently running any RegistrationMagic version older than 3.7.9.3, it is exposed to this serious security flaw.
Current Status
The vulnerability has been thoroughly analyzed by security researchers. Fortunately, the developers of the RegistrationMagic plugin have addressed this issue by releasing a patched version.
Severity Level
With a CVSS (Common Vulnerability Scoring System) score of 9.8 out of 10, this vulnerability is classified as CRITICAL. This is the highest possible severity rating, indicating an extremely dangerous flaw. A critical rating means that the vulnerability can be exploited remotely, often without any need for authentication or user interaction. Attackers can leverage such flaws to execute arbitrary code, gain full control over the compromised website, steal sensitive user data, deface web pages, or launch further attacks. For any website using the affected RegistrationMagic plugin, this translates to a high risk of complete system compromise.
Possible Solutions
The most important step to secure your website against this threat is to update your RegistrationMagic plugin immediately. The developers have released a fix in version 3.7.9.3. Updating to this version or any subsequent newer version will patch the vulnerability and protect your site.
Here’s what you should do:
- Update Immediately: Log in to your WordPress dashboard and update the “RegistrationMagic – Custom Registration Forms, User Registration, Payment, and User Login” plugin to version 3.7.9.3 or later. This is the most direct and effective solution.
- **Maintain Regular Updates:** Always ensure all your WordPress core files, themes, and other plugins are kept up-to-date. This practice is fundamental to overall website security. For more on this, consider reading our post on “Maintaining a Secure WordPress Installation.”
- **Implement Strong Backups:** Regularly back up your entire website. In the event of a security breach, a recent backup can be a lifesaver, allowing you to restore your site quickly.
- **Utilize a Web Application Firewall (WAF):** A WAF can provide an additional layer of defense by filtering malicious traffic before it reaches your application, helping to block exploits even for newly discovered vulnerabilities. Check out our guide on “Enhancing WordPress Security with a WAF.”
By taking these steps, you can significantly enhance your website’s security posture and protect it from this and other potential threats.
References
https://plugins.trac.wordpress.org/changeset/1733274/custom-registration-form-builder-with-submission-manager
https://www.wordfence.com/blog/2017/10/3-zero-day-plugin-vulnerabilities-exploited-wild/
https://www.wordfence.com/threat-intel/vulnerabilities/id/c2b79193-f8fc-4ea2-8973-fe292cfb926b?source=cve
