CVE-2025-49387: Elementor Forms File Upload RCE Flaw

CVE-2025-49387 Overview

CVE-2025-49387 is an Unrestricted Upload of File with Dangerous Type vulnerability (CWE-434) affecting the Drag and Drop File Upload for Elementor Forms WordPress plugin developed by add-ons.org. This critical vulnerability allows unauthenticated attackers to upload arbitrary files, including web shells, to vulnerable WordPress web servers. The flaw exists in versions from n/a through 1.5.3 of the plugin.

Critical Impact

This vulnerability enables unauthenticated remote attackers to upload malicious web shells to WordPress servers, potentially leading to complete server compromise, data exfiltration, and persistent backdoor access.

Affected Products

• Drag and Drop File Upload for Elementor Forms plugin versions through 1.5.3
• WordPress installations using the vulnerable plugin
• Web servers hosting affected WordPress sites

Discovery Timeline

• 2025-08-28 - CVE-2025-49387 published to NVD
• 2025-08-29 - Last updated in NVD database

Technical Details for CVE-2025-49387

Vulnerability Analysis

This arbitrary file upload vulnerability stems from inadequate validation of uploaded files within the Drag and Drop File Upload for Elementor Forms plugin. The plugin fails to properly restrict the types of files that can be uploaded through Elementor forms, allowing attackers to bypass intended security controls and upload executable server-side scripts.

The vulnerability is particularly severe because it requires no authentication (PR:N) and no user interaction (UI:N) to exploit. Attackers can directly interact with the vulnerable file upload functionality over the network, making this an ideal target for automated exploitation. The changed scope (S:C) indicates that successful exploitation can impact resources beyond the vulnerable component itself, potentially compromising the entire WordPress installation and underlying server infrastructure.

Root Cause

The root cause of CVE-2025-49387 is the lack of proper file type validation in the upload handling mechanism. The plugin does not adequately verify:

1. File extensions against a secure allowlist
2. MIME type validation to ensure uploaded content matches claimed file types
3. File content inspection to detect malicious payloads disguised as legitimate files

This absence of defense-in-depth file validation allows attackers to upload PHP web shells or other dangerous file types that can be executed on the server.

Attack Vector

The attack leverages the network-accessible file upload functionality exposed by the Elementor Forms integration. An attacker can craft a malicious HTTP request containing a web shell payload and submit it through a form configured with the vulnerable drag-and-drop file upload field.

Once the malicious file is uploaded, the attacker can access it directly via the web server to execute arbitrary commands. This attack pattern is commonly used to establish initial access, deploy ransomware, exfiltrate sensitive data, or pivot to other systems on the network.

The vulnerability mechanism involves submitting a crafted multipart form request to the Elementor form handler with a PHP web shell disguised or presented as the uploaded file. Due to insufficient validation, the server accepts and stores the malicious file in an accessible web directory. For detailed technical information, refer to the Patchstack Vulnerability Advisory.

Detection Methods for CVE-2025-49387

Indicators of Compromise

• Unexpected PHP files appearing in WordPress upload directories (wp-content/uploads/)
• Web shell files with obfuscated code or common web shell signatures
• Anomalous outbound connections from the web server
• Unusual process execution spawned from web server processes (e.g., www-data or apache user)

Detection Strategies

• Monitor file system changes in WordPress upload directories for new .php, .phtml, or other executable files
• Implement web application firewall (WAF) rules to detect and block web shell upload attempts
• Use file integrity monitoring to alert on unauthorized file creations in web-accessible directories
• Analyze web server access logs for requests to suspicious file paths in upload directories

Monitoring Recommendations

• Enable verbose logging for file upload activities in WordPress and review regularly
• Configure SIEM alerts for HTTP POST requests to Elementor form endpoints with suspicious file content
• Monitor server resource utilization for anomalies that may indicate web shell activity
• Implement endpoint detection and response (EDR) solutions like SentinelOne to detect post-exploitation behaviors

How to Mitigate CVE-2025-49387

Immediate Actions Required

• Update the Drag and Drop File Upload for Elementor Forms plugin to a patched version immediately
• Audit WordPress upload directories for any unauthorized or suspicious files
• Review web server access logs for evidence of exploitation attempts
• Consider temporarily disabling file upload functionality until patched
• Implement WAF rules to block common web shell patterns

Patch Information

Organizations should update the Drag and Drop File Upload for Elementor Forms plugin to a version newer than 1.5.3 that addresses this vulnerability. Check the Patchstack Vulnerability Advisory for the latest patch information and remediation guidance from the vendor.

Workarounds

• Restrict file upload functionality to authenticated users only where possible
• Implement server-side file type validation using allowlists for permitted extensions
• Configure .htaccess rules to prevent PHP execution in upload directories
• Use a web application firewall to filter malicious upload requests

# Apache .htaccess configuration to prevent PHP execution in uploads directory
# Place this file in wp-content/uploads/.htaccess

<FilesMatch "\.(?i:php|phtml|php3|php4|php5|phps)$">
    Order Deny,Allow
    Deny from all
</FilesMatch>

# Alternative: Disable PHP engine entirely in uploads
php_flag engine off