CVE-2025-50002: Farost Energia RCE Vulnerability

CVE-2025-50002 Overview

CVE-2025-50002 is an Unrestricted Upload of File with Dangerous Type vulnerability (CWE-434) affecting the Farost Energia WordPress theme. This vulnerability allows attackers to upload a web shell to a web server, potentially leading to complete server compromise. The flaw exists in all versions of the Energia theme through version 1.1.2.

Critical Impact

This vulnerability enables attackers to upload malicious web shells to WordPress installations, granting them persistent remote access and the ability to execute arbitrary commands on the server.

Affected Products

• Farost Energia WordPress Theme versions up to and including 1.1.2

Discovery Timeline

• 2026-01-22 - CVE CVE-2025-50002 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2025-50002

Vulnerability Analysis

This vulnerability falls under CWE-434 (Unrestricted Upload of File with Dangerous Type), a classification that describes scenarios where an application allows users to upload files without properly validating the file type, content, or extension. In the context of the Energia WordPress theme, the file upload functionality fails to implement adequate security controls, enabling attackers to bypass intended restrictions and upload executable files such as PHP web shells.

Web shell attacks represent one of the most dangerous attack vectors against web applications, as they provide attackers with a persistent backdoor that can survive server restarts and remain hidden among legitimate files. Once uploaded, attackers can leverage the web shell to execute system commands, exfiltrate sensitive data, pivot to other systems on the network, or deploy additional malware.

Root Cause

The root cause of this vulnerability is insufficient validation of uploaded files within the Energia theme's file upload functionality. The theme fails to properly verify that uploaded files are of expected safe types (such as images or documents) and does not adequately check file extensions, MIME types, or file content. This allows an attacker to upload files with executable extensions like .php that are subsequently processed by the web server.

Attack Vector

An attacker can exploit this vulnerability by crafting a malicious request to the vulnerable file upload endpoint within the Energia theme. The attack typically proceeds as follows:

1. The attacker identifies the vulnerable upload endpoint in the Energia theme
2. A malicious PHP file (web shell) is crafted with code that allows remote command execution
3. The attacker submits the malicious file through the upload functionality
4. Due to missing or inadequate file type validation, the file is accepted and stored on the server
5. The attacker accesses the uploaded web shell via its URL path
6. The attacker can now execute arbitrary commands on the server with the privileges of the web server process

The vulnerability does not require authentication in many scenarios, making it particularly dangerous as any remote attacker could potentially exploit it.

Detection Methods for CVE-2025-50002

Indicators of Compromise

• Unexpected PHP files in WordPress upload directories (typically wp-content/uploads/) with suspicious names or recent timestamps
• Web server access logs showing requests to unusual PHP files in upload directories
• Outbound network connections from the web server to unknown external IP addresses
• Unexpected process execution or system commands originating from the web server process

Detection Strategies

• Monitor file system changes in WordPress upload directories for newly created PHP or executable files
• Implement web application firewall (WAF) rules to detect and block web shell upload attempts
• Review web server access logs for POST requests to theme file upload endpoints followed by GET requests to unusual file paths
• Deploy file integrity monitoring to detect unauthorized file additions or modifications

Monitoring Recommendations

• Enable verbose logging for WordPress file upload operations
• Configure alerts for any PHP file creation in upload directories
• Monitor for unusual outbound connections from the web server
• Implement real-time malware scanning of uploaded files

How to Mitigate CVE-2025-50002

Immediate Actions Required

• Remove or disable the Energia theme immediately if currently in use
• Audit the WordPress uploads directory for any suspicious PHP files or web shells
• Review web server logs for evidence of exploitation attempts
• Consider switching to a well-maintained and security-audited WordPress theme

Patch Information

At the time of publication, the affected versions include all releases through 1.1.2. Organizations should monitor the Patchstack WordPress Vulnerability Report for updates on available patches or mitigations from the vendor.

Workarounds

• Disable or remove the Energia theme until a patch is available
• Implement server-level restrictions to prevent PHP execution in upload directories
• Configure web server to block requests to PHP files in upload paths
• Deploy a web application firewall with rules to block malicious file uploads

# Apache configuration to prevent PHP execution in uploads directory
# Add to .htaccess in wp-content/uploads/
<FilesMatch "\.php$">
    Order Allow,Deny
    Deny from all
</FilesMatch>

# Nginx configuration alternative
# Add to server block
location ~* /wp-content/uploads/.*\.php$ {
    deny all;
}