CVE-2026-28024: Helion Theme PHP File Inclusion Flaw

CVE-2026-28024 Overview

CVE-2026-28024 is a Local File Inclusion (LFI) vulnerability in the Helion WordPress theme developed by axiomthemes. The vulnerability stems from improper control of filename parameters used in PHP include/require statements, allowing attackers to include arbitrary local files from the server. This can lead to disclosure of sensitive information, configuration files, or potentially code execution if combined with other attack vectors.

Critical Impact

Attackers can exploit this LFI vulnerability to read sensitive files from the web server, potentially exposing database credentials, configuration files, and other sensitive data stored on the system.

Affected Products

• Helion WordPress Theme versions through 1.1.12
• WordPress installations using the Helion theme by axiomthemes

Discovery Timeline

• 2026-03-05 - CVE-2026-28024 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-28024

Vulnerability Analysis

This vulnerability is classified as CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). The Helion WordPress theme fails to properly validate or sanitize user-supplied input before using it in PHP include or require statements. This allows an attacker to manipulate the file path parameter to include arbitrary files from the local file system.

Local File Inclusion vulnerabilities in WordPress themes are particularly dangerous because they can expose sensitive WordPress configuration files such as wp-config.php, which contains database credentials, authentication keys, and other critical settings. Additionally, attackers may be able to read server configuration files, log files, or other sensitive data depending on the server's file permissions.

Root Cause

The root cause of this vulnerability is insufficient input validation and sanitization of user-controlled parameters that are subsequently used in PHP file inclusion functions. The theme code likely accepts a filename or path parameter without adequately restricting the allowed values or preventing directory traversal sequences such as ../.

Attack Vector

An attacker can exploit this vulnerability by crafting malicious requests that manipulate the file inclusion parameter to reference sensitive local files. Common exploitation techniques include:

The attacker typically identifies a vulnerable parameter that controls file inclusion and modifies it to traverse directories using sequences like ../ to access files outside the intended directory. Common targets include /etc/passwd on Linux systems, WordPress configuration files (wp-config.php), and server log files that may contain sensitive information. If the server allows writing to accessible locations, attackers may chain this with file upload functionality to achieve remote code execution.

Detection Methods for CVE-2026-28024

Indicators of Compromise

• Unusual HTTP requests containing directory traversal patterns (../, ..%2f, ..%252f) in URL parameters
• Access attempts to sensitive files like wp-config.php, /etc/passwd, or server configuration files
• Anomalous requests to theme endpoints with unexpected file path parameters
• Log entries showing requests with null byte sequences (%00) or encoding variations

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block directory traversal patterns in requests
• Monitor WordPress access logs for suspicious requests targeting the Helion theme files
• Deploy intrusion detection systems (IDS) with signatures for LFI exploitation attempts
• Enable file integrity monitoring to detect unauthorized access to sensitive configuration files

Monitoring Recommendations

• Configure real-time alerting for requests containing path traversal sequences targeting theme directories
• Implement audit logging for file access operations on the WordPress server
• Monitor for unusual outbound connections that may indicate data exfiltration following successful exploitation
• Review web server error logs for failed file inclusion attempts that may indicate active exploitation

How to Mitigate CVE-2026-28024

Immediate Actions Required

• Disable or remove the Helion theme if it is not actively required for site functionality
• Review and restrict file permissions on sensitive files including wp-config.php
• Implement WAF rules to block requests containing directory traversal patterns
• Monitor for updated versions of the Helion theme that address this vulnerability

Patch Information

Organizations should check with axiomthemes for an updated version of the Helion theme that addresses this vulnerability. For detailed information about this vulnerability and potential patches, refer to the Patchstack WordPress Vulnerability Database.

Until a patch is available, consider implementing virtual patching through WAF rules or temporarily switching to a different WordPress theme.

Workarounds

• Deploy a Web Application Firewall (WAF) with rules to filter requests containing LFI attack patterns
• Restrict PHP's open_basedir configuration to limit accessible directories
• Implement file access controls to prevent the web server user from reading sensitive system files
• Consider using a security plugin that provides virtual patching capabilities for WordPress

# Example: Restrict PHP open_basedir in Apache configuration
# Add to .htaccess or Apache virtual host configuration
php_admin_value open_basedir /var/www/html/wordpress:/tmp

# Example: Block directory traversal in Nginx
location ~ \.\. {
    deny all;
}