CVE-2025-49060: Wastia CMS Web Shell Upload Vulnerability

CVE-2025-49060 Overview

CVE-2025-49060 is an Unrestricted Upload of File with Dangerous Type vulnerability in the CMSSuperHeroes Wastia WordPress theme. This vulnerability allows unauthenticated attackers to upload arbitrary files, including web shells, to a vulnerable web server. The flaw stems from inadequate validation of uploaded file types, enabling malicious actors to achieve remote code execution on affected WordPress installations.

Critical Impact

This vulnerability allows unauthenticated attackers to upload web shells and execute arbitrary code on affected WordPress sites, potentially leading to complete server compromise.

Affected Products

• CMSSuperHeroes Wastia WordPress Theme versions prior to 1.1.3

Discovery Timeline

• 2025-10-22 - CVE-2025-49060 published to NVD
• 2026-01-20 - Last updated in NVD database

Technical Details for CVE-2025-49060

Vulnerability Analysis

This vulnerability is classified as CWE-434 (Unrestricted Upload of File with Dangerous Type), a severe file upload vulnerability that allows attackers to bypass intended restrictions and upload dangerous file types to the server. The Wastia WordPress theme fails to properly validate and sanitize file uploads, enabling malicious users to upload executable scripts such as PHP web shells.

When exploited, this vulnerability grants attackers the ability to execute arbitrary PHP code on the server with the same privileges as the web server process. This can lead to complete compromise of the WordPress installation, data exfiltration, defacement, and lateral movement within the hosting environment. The vulnerability is particularly dangerous because it requires no authentication, meaning any remote attacker with network access to the WordPress site can exploit it.

Root Cause

The root cause of this vulnerability lies in the insufficient file type validation within the Wastia theme's file upload functionality. The theme fails to implement proper server-side checks for uploaded file extensions and MIME types, allowing attackers to bypass any client-side restrictions and upload executable PHP files directly to the web server.

Attack Vector

The attack can be performed remotely over the network without requiring any authentication or user interaction. An attacker can craft a malicious HTTP request to upload a PHP web shell disguised as a legitimate file. Once uploaded, the attacker can access the shell through a web browser to execute arbitrary commands on the server.

The exploitation process typically involves:

1. Identifying a WordPress site running a vulnerable version of the Wastia theme
2. Crafting a multipart form request containing a PHP web shell
3. Submitting the malicious upload request to the vulnerable endpoint
4. Accessing the uploaded web shell to execute commands on the server

For detailed technical information, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-49060

Indicators of Compromise

• Unexpected PHP files appearing in upload directories, particularly with names like shell.php, c99.php, or randomized alphanumeric names
• Unusual outbound network connections from the web server process
• Suspicious HTTP POST requests to theme upload endpoints with unusual file extensions
• Web server logs showing access to newly created PHP files in upload folders

Detection Strategies

• Implement file integrity monitoring (FIM) to detect unauthorized file creation in WordPress directories
• Configure web application firewalls (WAF) to block requests containing common web shell signatures
• Monitor web server access logs for POST requests to theme-related upload endpoints
• Deploy endpoint detection and response (EDR) solutions to identify suspicious process execution from web server contexts

Monitoring Recommendations

• Enable verbose logging for all file upload operations on WordPress installations
• Set up alerts for new PHP file creation in theme directories and upload folders
• Monitor for unusual command execution patterns from www-data or web server user accounts
• Implement regular security scans using WordPress security plugins to detect backdoors and malicious files

How to Mitigate CVE-2025-49060

Immediate Actions Required

• Update the Wastia WordPress theme to version 1.1.3 or later immediately
• Review all WordPress upload directories for suspicious PHP files
• Implement a web application firewall (WAF) rule to restrict file upload types
• Consider temporarily deactivating the Wastia theme until patching is complete

Patch Information

CMSSuperHeroes has addressed this vulnerability in Wastia theme version 1.1.3. Users should update through the WordPress admin dashboard or by manually downloading the latest version from the theme vendor. After updating, administrators should perform a thorough security audit to ensure no web shells were uploaded prior to patching.

For more information, see the Patchstack WordPress Vulnerability Report.

Workarounds

• Restrict file upload permissions at the server level by configuring .htaccess to deny PHP execution in upload directories
• Implement additional file type validation using a security plugin such as Wordfence or Sucuri
• Apply network-level access controls to limit upload functionality to trusted IP addresses only
• Use server configuration to disable PHP execution in WordPress upload directories

# Apache .htaccess configuration to prevent PHP execution in uploads
# Add to wp-content/uploads/.htaccess
<FilesMatch "\.(php|php\d|phtml|php-s)$">
    Require all denied
</FilesMatch>

# Alternative using handler removal
<FilesMatch "\.(?:php|phtml|php\d|php-s)$">
    SetHandler none
    SetHandler default-handler
</FilesMatch>