CVE-2025-67684: Quick.Cart RCE Vulnerability

CVE-2025-67684 Overview

Quick.Cart is vulnerable to Local File Inclusion (LFI) and Path Traversal issues in the theme selection mechanism. The vulnerability allows a privileged user to upload arbitrary file contents while only validating the filename extension. This insufficient validation enables an attacker to include and execute uploaded PHP code, resulting in Remote Code Execution (RCE) on the server.

The vendor (Open Solution) was notified about this vulnerability but did not respond with details regarding the vulnerability or the vulnerable version range. Only version 6.7 was tested and confirmed as vulnerable; other versions were not tested and might also be affected.

Critical Impact

This vulnerability allows authenticated attackers to achieve Remote Code Execution through the combination of arbitrary file upload and Local File Inclusion in the theme selection mechanism.

Affected Products

• Quick.Cart version 6.7 (confirmed vulnerable)
• Other Quick.Cart versions (potentially vulnerable, not tested)

Discovery Timeline

• 2026-01-22 - CVE CVE-2025-67684 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2025-67684

Vulnerability Analysis

This vulnerability combines two distinct security flaws to achieve Remote Code Execution. The first flaw is an insufficient file upload validation mechanism that only checks filename extensions rather than performing comprehensive content validation. The second flaw is a Local File Inclusion vulnerability in the theme selection mechanism that allows inclusion of arbitrary files from the server's filesystem.

When exploited together, these vulnerabilities create a critical attack chain. An attacker with privileged access can upload a file containing malicious PHP code, disguising it with an allowed extension. Subsequently, by manipulating the theme selection mechanism through path traversal sequences, the attacker can include and execute the uploaded PHP file, gaining arbitrary code execution capabilities on the underlying server.

The vulnerability is classified under CWE-22 (Improper Limitation of a Pathname to a Restricted Directory), commonly known as Path Traversal. This classification reflects the core issue where user-supplied input containing path traversal characters (such as ../) is not properly sanitized before being used in file system operations.

Root Cause

The root cause of this vulnerability lies in the inadequate input validation within Quick.Cart's theme selection functionality. The application fails to properly sanitize user-supplied input used in file path construction, allowing directory traversal sequences to escape the intended directory scope. Additionally, the file upload mechanism relies solely on filename extension validation without examining the actual file contents or implementing proper content-type verification. This combination of weak input validation and insufficient upload controls creates the conditions necessary for successful exploitation.

Attack Vector

The attack is network-based and requires privileged (authenticated) access to the Quick.Cart administrative interface. An attacker must first authenticate to the application with sufficient privileges to access the theme management or file upload functionality. Once authenticated, the attacker uploads a malicious PHP file, potentially disguised with an innocuous extension that passes the basic validation checks.

The attacker then exploits the path traversal vulnerability in the theme selection mechanism by crafting a request that includes directory traversal sequences (e.g., ../../uploads/malicious.php) to reference the uploaded malicious file. When the application processes this request and includes the specified file, the malicious PHP code executes with the privileges of the web server process, granting the attacker Remote Code Execution capabilities.

Detection Methods for CVE-2025-67684

Indicators of Compromise

• Unusual file uploads to the Quick.Cart upload directories containing PHP code or webshell signatures
• HTTP requests to theme-related endpoints containing path traversal sequences such as ../ or URL-encoded variants like %2e%2e%2f
• Unexpected PHP files appearing in upload directories or temporary folders
• Web server access logs showing requests with suspicious path manipulation patterns targeting theme selection functionality

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block path traversal patterns in HTTP requests, particularly those targeting theme or template endpoints
• Monitor file system activity for new PHP files being created in upload directories or unexpected locations within the Quick.Cart installation
• Review web server access logs for requests containing encoded directory traversal sequences or attempts to reference files outside the expected theme directories
• Deploy file integrity monitoring (FIM) on the Quick.Cart installation to detect unauthorized file modifications or additions

Monitoring Recommendations

• Enable detailed logging for the Quick.Cart administrative interface, capturing all file upload activities and theme selection changes
• Configure SIEM rules to alert on sequences of file upload followed by unusual file inclusion requests from the same source IP
• Monitor outbound network connections from the web server process for potential command-and-control communication or data exfiltration attempts
• Implement real-time alerting for any PHP file execution from upload directories

How to Mitigate CVE-2025-67684

Immediate Actions Required

• Restrict administrative access to Quick.Cart to trusted IP addresses only until a patch is available
• Review and audit all users with privileged access to the Quick.Cart administrative interface
• Implement additional authentication controls such as multi-factor authentication for administrative access
• Consider temporarily disabling file upload functionality if not critical to operations

Patch Information

As of the last modified date (2026-01-22), the vendor (Open Solution) has not responded to vulnerability disclosure requests and no official patch information is available. Organizations using Quick.Cart should monitor the Open Solution Product Page for updates and consider the workarounds listed below until an official fix is released.

For additional technical details, refer to the CERT Poland CVE-2025-67683 Analysis.

Workarounds

• Configure web server rules to deny requests containing path traversal patterns (e.g., Apache mod_rewrite or Nginx location rules) targeting theme selection endpoints
• Implement strict file upload validation at the web server level, rejecting any files containing PHP code regardless of extension
• Use PHP configuration settings such as open_basedir to restrict file inclusion to specific directories only
• Consider placing Quick.Cart behind a reverse proxy with additional security controls to filter malicious requests

# Apache .htaccess example to block path traversal attempts
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.\\) [NC,OR]
RewriteCond %{REQUEST_URI} (\.\./|\.\.\\) [NC]
RewriteRule .* - [F,L]

# Nginx location block to restrict theme directory access
location ~* /themes/ {
    # Only allow specific file types
    location ~* \.(css|js|png|jpg|gif|ico|woff|woff2|ttf|svg)$ {
        allow all;
    }
    # Deny PHP execution in themes directory
    location ~* \.php$ {
        deny all;
    }
}