CVE-2026-28028: MoneyFlow PHP File Inclusion Vulnerability

CVE-2026-28028 Overview

CVE-2026-28028 is a Local File Inclusion (LFI) vulnerability affecting the ThemeREX MoneyFlow WordPress theme. The vulnerability stems from improper control of filename for include/require statements in PHP, classified under CWE-98 (PHP Remote File Inclusion). This flaw allows attackers to include local files on the server, potentially leading to sensitive information disclosure, configuration file access, or in certain scenarios, remote code execution through log poisoning or other techniques.

Critical Impact

Attackers can leverage this Local File Inclusion vulnerability to read sensitive files from the WordPress installation, including configuration files containing database credentials, potentially compromising the entire website and its data.

Affected Products

• ThemeREX MoneyFlow WordPress Theme version 1.0 and earlier
• WordPress installations using the MoneyFlow theme

Discovery Timeline

• 2026-03-05 - CVE-2026-28028 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-28028

Vulnerability Analysis

This vulnerability is categorized as an Improper Control of Filename for Include/Require Statement in PHP Program (CWE-98). The MoneyFlow WordPress theme fails to properly sanitize user-supplied input before using it in PHP file inclusion statements. When a PHP application uses functions like include(), include_once(), require(), or require_once() with user-controllable parameters without proper validation, attackers can manipulate the file path to include arbitrary local files.

In the context of WordPress themes, this typically occurs in template loading mechanisms, dynamic content inclusion features, or AJAX handlers that accept file path parameters. The vulnerability allows attackers to traverse directories and access files outside the intended scope of the web application.

Root Cause

The root cause of CVE-2026-28028 lies in insufficient input validation and sanitization within the MoneyFlow theme's PHP code. The application fails to implement proper safeguards such as:

• Whitelist validation for allowed file paths
• Proper sanitization of directory traversal sequences (e.g., ../)
• Basename extraction to prevent path manipulation
• Restriction of file inclusion to specific directories

Without these controls, user input is passed directly or with minimal filtering to PHP include/require functions, enabling arbitrary file access.

Attack Vector

The attack vector for this LFI vulnerability involves an attacker sending crafted HTTP requests containing manipulated file path parameters. By injecting directory traversal sequences such as ../../../, an attacker can navigate outside the web root directory and access sensitive system files.

Common exploitation targets in WordPress environments include:

• wp-config.php - Contains database credentials and authentication keys
• /etc/passwd - System user information (Linux)
• Log files - Can be poisoned for potential RCE
• Other plugin/theme configuration files

The exploitation typically does not require authentication, though specific exploitation scenarios may vary based on how the vulnerable functionality is exposed. For detailed technical information, refer to the Patchstack vulnerability database entry.

Detection Methods for CVE-2026-28028

Indicators of Compromise

• Unusual HTTP requests containing directory traversal sequences (../, ..%2f, ..%5c) in URL parameters or POST data
• Web server access logs showing requests attempting to access files like wp-config.php, /etc/passwd, or other sensitive paths
• Error logs indicating failed file inclusion attempts or warnings about non-existent paths
• Unexpected file access patterns in web application firewall (WAF) logs

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block directory traversal patterns in request parameters
• Implement file integrity monitoring on WordPress core files and configuration
• Review web server access logs for suspicious patterns targeting theme endpoints with path manipulation attempts
• Monitor for unusual PHP error messages related to file inclusion failures

Monitoring Recommendations

• Enable detailed logging for all HTTP requests to WordPress installations using the MoneyFlow theme
• Configure alerting for any access attempts to sensitive files like wp-config.php through non-standard paths
• Implement real-time monitoring with SentinelOne Singularity Platform to detect file access anomalies and potential exploitation attempts
• Regularly audit WordPress access logs for reconnaissance activity targeting theme-specific endpoints

How to Mitigate CVE-2026-28028

Immediate Actions Required

• Disable or remove the MoneyFlow theme immediately if it is active on production WordPress installations
• Switch to a trusted alternative WordPress theme until a patched version is available
• Implement WAF rules to block directory traversal attempts targeting your WordPress installation
• Review server logs to identify any potential exploitation attempts that may have already occurred
• Restrict file system permissions to limit the impact of potential file inclusion attacks

Patch Information

As of the last update on 2026-03-05, the vulnerability affects MoneyFlow theme versions through 1.0. Website administrators should monitor the Patchstack advisory and ThemeREX's official channels for patch availability. Until a patch is released, removing the theme is the most effective mitigation strategy.

Workarounds

• Remove the MoneyFlow theme entirely from the WordPress installation if not critical to site functionality
• Implement strict input validation at the web server or reverse proxy level using ModSecurity or similar WAF solutions
• Use PHP open_basedir directive to restrict file access to the WordPress installation directory only
• Deploy virtual patching through WordPress security plugins that can filter malicious requests before they reach the vulnerable code

# Configuration example - PHP open_basedir restriction in php.ini
# Restrict PHP file access to WordPress directory only
open_basedir = /var/www/html/wordpress:/tmp

# Apache ModSecurity rule to block directory traversal
# Add to your ModSecurity configuration
SecRule REQUEST_URI|ARGS|ARGS_NAMES "@contains ../" \
    "id:1001,\
    phase:2,\
    deny,\
    status:403,\
    log,\
    msg:'Directory traversal attempt blocked - CVE-2026-28028 protection'"