CVE-2026-22441: Zentrum Theme File Inclusion Vulnerability

CVE-2026-22441 Overview

CVE-2026-22441 is a Local File Inclusion (LFI) vulnerability affecting the Zentrum WordPress theme developed by Elated-Themes. The vulnerability stems from improper control of filename parameters used in PHP include/require statements, allowing attackers to include arbitrary local files on the server. This weakness is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program).

Critical Impact

Successful exploitation of this LFI vulnerability could allow attackers to read sensitive configuration files, access credentials, or potentially achieve remote code execution through log poisoning or other advanced techniques.

Affected Products

• Elated-Themes Zentrum WordPress Theme version 1.0 and earlier
• WordPress installations using vulnerable Zentrum theme versions

Discovery Timeline

• 2026-03-05 - CVE-2026-22441 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-22441

Vulnerability Analysis

The Zentrum WordPress theme contains a PHP Local File Inclusion vulnerability due to improper sanitization of user-controlled input used in file inclusion operations. When a PHP application dynamically includes files based on user input without adequate validation, attackers can manipulate the file path to include unintended files from the local filesystem.

In the context of WordPress themes, LFI vulnerabilities typically arise when template loading functions or AJAX handlers accept file parameters without proper path traversal prevention. This can expose sensitive files such as wp-config.php, system files like /etc/passwd, or application logs that may contain sensitive data.

Root Cause

The root cause of this vulnerability is the lack of proper input validation and sanitization on filename parameters passed to PHP's include(), require(), include_once(), or require_once() functions. The theme fails to implement adequate controls such as:

• Whitelist validation for allowed file names
• Path traversal sequence filtering (e.g., ../)
• Base directory enforcement to restrict file access scope

Attack Vector

An attacker can exploit this vulnerability by crafting malicious requests that manipulate file path parameters to traverse directories and access files outside the intended scope. The attack typically involves injecting path traversal sequences such as ../ to navigate the filesystem and include sensitive files.

The exploitation mechanism involves manipulating parameters in HTTP requests (GET or POST) that are subsequently used in PHP file inclusion functions. For example, an attacker might submit a request with a parameter like ../../wp-config.php to attempt to include the WordPress configuration file, which contains database credentials.

For detailed technical analysis and proof-of-concept information, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2026-22441

Indicators of Compromise

• Unusual HTTP requests containing path traversal sequences (../, ..%2f, %2e%2e/) in theme-related parameters
• Access logs showing requests targeting theme files with suspicious query strings
• Failed or successful attempts to access sensitive files through web requests
• Unexpected error messages revealing file system paths in response bodies

Detection Strategies

• Monitor web server access logs for requests containing directory traversal patterns in URL parameters
• Implement Web Application Firewall (WAF) rules to detect and block LFI attack patterns
• Enable PHP error logging and monitor for file inclusion failures that indicate exploitation attempts
• Deploy file integrity monitoring on critical WordPress configuration files

Monitoring Recommendations

• Configure alerting for high-volume requests targeting theme endpoints with parameter variations
• Monitor for access attempts to sensitive files like wp-config.php, /etc/passwd, or log files
• Review WordPress activity logs for unusual theme-related operations
• Implement network-level monitoring for data exfiltration following potential LFI exploitation

How to Mitigate CVE-2026-22441

Immediate Actions Required

• Verify if the Zentrum theme (version 1.0 or earlier) is installed on your WordPress installations
• Disable or remove the vulnerable theme immediately if no patch is available
• Switch to an alternative theme until the vendor releases a security update
• Review access logs for signs of exploitation attempts

Patch Information

At the time of publication, administrators should check with Elated-Themes for an updated version of the Zentrum theme that addresses this vulnerability. Consult the Patchstack WordPress Vulnerability Report for the latest patch status and remediation guidance.

Workarounds

• Implement WAF rules to block requests containing path traversal sequences targeting theme endpoints
• Restrict file system permissions to limit the impact of potential LFI exploitation
• Use PHP's open_basedir configuration directive to restrict file access scope
• Apply virtual patching through security plugins until an official patch is available

# Example Apache mod_rewrite rules to block path traversal attempts
# Add to .htaccess in WordPress root directory
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.%2f|%2e%2e/) [NC,OR]
RewriteCond %{REQUEST_URI} (\.\./|\.\.%2f|%2e%2e/) [NC]
RewriteRule .* - [F,L]