CVE-2025-68555: Nutrie File Upload RCE Vulnerability

CVE-2025-68555 Overview

CVE-2025-68555 is an Unrestricted Upload of File with Dangerous Type vulnerability (CWE-434) in the zozothemes Nutrie WordPress theme. This vulnerability allows an attacker to upload a web shell to a web server, potentially leading to complete server compromise. The flaw exists in Nutrie theme versions prior to 2.0.1.

Critical Impact

This vulnerability enables attackers to upload arbitrary files including web shells, providing persistent remote access and full control over the affected WordPress installation and underlying server.

Affected Products

• zozothemes Nutrie WordPress Theme versions prior to 2.0.1

Discovery Timeline

• 2026-03-05 - CVE CVE-2025-68555 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2025-68555

Vulnerability Analysis

This vulnerability stems from inadequate file upload validation in the Nutrie WordPress theme. The application fails to properly restrict the types of files that can be uploaded, allowing attackers to bypass security controls and upload malicious executable files such as PHP web shells. Once uploaded, these web shells can be accessed directly through the web server, granting the attacker command execution capabilities on the server.

The vulnerability is particularly dangerous because it can be exploited over the network with low attack complexity. An attacker with low-level privileges on the WordPress site can leverage this flaw to escalate their access significantly, potentially compromising not only the WordPress installation but also other sites hosted on the same server.

Root Cause

The root cause of CVE-2025-68555 is improper input validation in the file upload functionality of the Nutrie theme. The application does not adequately verify the file type, extension, or content of uploaded files before storing them in a web-accessible directory. This allows attackers to upload files with dangerous extensions (such as .php) that the web server will execute when accessed.

Key contributing factors include:

• Missing or inadequate file type validation
• Lack of content-type verification
• Uploaded files stored in web-accessible directories
• No server-side restrictions on executable file uploads

Attack Vector

The attack vector for this vulnerability is network-based. An attacker with authenticated access to the WordPress site (even with minimal privileges) can exploit the vulnerable file upload functionality in the Nutrie theme to upload a malicious PHP web shell. The exploitation process typically involves:

1. Authentication: The attacker gains authenticated access to the WordPress site, even with limited user privileges
2. File Upload: Using the vulnerable upload functionality, the attacker uploads a PHP web shell disguised or presented as a legitimate file
3. Access: The attacker navigates to the uploaded web shell via direct URL access
4. Execution: The web server executes the PHP code, providing the attacker with remote command execution capabilities

The vulnerability mechanism involves insufficient server-side validation of uploaded file types and extensions. When a file is uploaded through the vulnerable Nutrie theme functionality, the application fails to verify that the file is a safe type (such as an image) before saving it to a location accessible via the web server. For detailed technical analysis, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2025-68555

Indicators of Compromise

• Presence of unexpected PHP files in theme upload directories or other web-accessible locations
• Web server access logs showing requests to suspicious files with PHP extensions in theme directories
• Unusual outbound network connections from the web server to unknown external hosts
• Evidence of command execution or system enumeration activity in server logs

Detection Strategies

• Monitor file system changes in WordPress theme directories, particularly for new PHP files or files with double extensions
• Implement web application firewall (WAF) rules to detect and block web shell upload attempts
• Review web server access logs for requests to newly created PHP files in non-standard locations
• Deploy endpoint detection solutions capable of identifying web shell behavior patterns

Monitoring Recommendations

• Enable file integrity monitoring (FIM) for WordPress installations, focusing on theme and plugin directories
• Configure alerting for any new executable files created in web-accessible directories
• Monitor for suspicious POST requests containing PHP code or shell commands
• Implement regular security scans of WordPress installations to detect unauthorized file changes

How to Mitigate CVE-2025-68555

Immediate Actions Required

• Update the Nutrie WordPress theme to version 2.0.1 or later immediately
• Audit all WordPress installations for the presence of the vulnerable Nutrie theme version
• Scan theme directories for suspicious files that may have been uploaded through this vulnerability
• Review web server logs for indicators of exploitation

Patch Information

The vulnerability has been addressed in Nutrie theme version 2.0.1. Site administrators should update to this version or later to remediate the vulnerability. For additional details, consult the Patchstack Vulnerability Report.

Workarounds

• Implement web application firewall (WAF) rules to block file upload requests containing executable content
• Restrict file upload permissions at the web server level to prevent execution of uploaded files
• Configure .htaccess rules to deny execution of PHP files in upload directories
• Temporarily disable theme-related file upload functionality until the patch can be applied

# Configuration example - Prevent PHP execution in upload directories
# Add to .htaccess in the theme's upload directory
<FilesMatch "\.php$">
    Order Allow,Deny
    Deny from all
</FilesMatch>