CVE-2026-28093: ThemeREX Ozisti LFI Vulnerability

CVE-2026-28093 Overview

CVE-2026-28093 is a PHP Local File Inclusion (LFI) vulnerability in the ThemeREX Ozisti WordPress theme. 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 flaw is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program).

Critical Impact

Successful exploitation allows attackers to read sensitive files from the server, potentially exposing configuration files, credentials, and other confidential data. In certain configurations, this can escalate to remote code execution.

Affected Products

• ThemeREX Ozisti WordPress Theme versions through 1.1.10
• WordPress installations using vulnerable Ozisti theme versions

Discovery Timeline

• March 5, 2026 - CVE-2026-28093 published to NVD
• March 5, 2026 - Last updated in NVD database

Technical Details for CVE-2026-28093

Vulnerability Analysis

This vulnerability exists due to insufficient input validation and sanitization of user-controlled parameters that are subsequently used in PHP file inclusion functions (such as include(), include_once(), require(), or require_once()). The Ozisti theme fails to properly validate or restrict file paths before including them, enabling attackers to traverse the file system and include files outside the intended directory scope.

Local File Inclusion vulnerabilities in WordPress themes are particularly dangerous because WordPress installations often contain sensitive configuration files like wp-config.php that store database credentials and authentication keys.

Root Cause

The root cause of CVE-2026-28093 is the lack of proper input sanitization and path validation for user-supplied parameters used in PHP include statements. The affected theme does not implement adequate filtering to prevent directory traversal sequences (such as ../) or validate that requested files reside within allowed directories. This allows attackers to manipulate the file path parameter to include arbitrary local files.

Attack Vector

The vulnerability is exploitable over the network without authentication. An attacker can craft malicious HTTP requests containing path traversal sequences to access sensitive files on the target server. The attack typically involves manipulating URL parameters or form inputs that are passed directly to file inclusion functions.

Exploitation techniques may include:

• Using directory traversal sequences (../) to escape the intended directory and access system files
• Targeting sensitive WordPress configuration files such as wp-config.php
• Combining with log poisoning or other techniques to potentially achieve code execution
• Accessing server environment files like /etc/passwd on Linux systems

For detailed technical analysis, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2026-28093

Indicators of Compromise

• HTTP requests to the WordPress site containing directory traversal sequences (e.g., ../, ..%2f, %2e%2e/)
• Requests attempting to access sensitive files such as wp-config.php, /etc/passwd, or log files
• Unusual file access patterns in web server logs targeting theme-specific endpoints
• Error logs indicating failed file inclusion attempts with non-existent paths

Detection Strategies

• Monitor web application firewall (WAF) logs for path traversal patterns in requests targeting the Ozisti theme
• Implement intrusion detection rules to alert on requests containing encoded or unencoded directory traversal sequences
• Review web server access logs for requests with unusual file path parameters
• Deploy file integrity monitoring on critical WordPress configuration files

Monitoring Recommendations

• Enable verbose logging for the WordPress installation and monitor for suspicious file access attempts
• Configure alerting for any access attempts to wp-config.php from web-accessible endpoints
• Monitor for unusual error messages in PHP logs related to file inclusion failures
• Implement real-time monitoring for path traversal attack signatures in incoming HTTP traffic

How to Mitigate CVE-2026-28093

Immediate Actions Required

• Update the Ozisti theme to the latest patched version as soon as one becomes available from ThemeREX
• If no patch is available, consider temporarily disabling or replacing the vulnerable theme
• Implement web application firewall rules to block path traversal patterns
• Review and restrict file system permissions on the WordPress installation

Patch Information

Organizations using the ThemeREX Ozisti theme should monitor for security updates from the vendor. At the time of publication, versions through 1.1.10 are confirmed vulnerable. Consult the Patchstack WordPress Vulnerability Report for the latest patch availability information.

Workarounds

• Deploy a web application firewall (WAF) with rules to block requests containing path traversal sequences
• Restrict PHP's open_basedir directive to limit file system access from PHP scripts
• Implement server-side input validation to reject requests containing ../ or encoded variants
• Consider using a virtual patching solution until an official fix is released

# Apache .htaccess rule to block path traversal attempts
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.\\) [NC,OR]
RewriteCond %{QUERY_STRING} (%2e%2e/|%2e%2e\\) [NC]
RewriteRule .* - [F,L]

# PHP open_basedir restriction in php.ini or .htaccess
# Limits PHP file operations to specified directories
php_admin_value open_basedir "/var/www/html/:/tmp/"