CVE-2026-28029: ThemeREX EmojiNation LFI Vulnerability

CVE-2026-28029 Overview

CVE-2026-28029 is a Local File Inclusion (LFI) vulnerability in the ThemeREX EmojiNation WordPress theme. This vulnerability arises from improper control of filename parameters used in PHP include/require statements, allowing attackers to include arbitrary local files from the server's filesystem.

Critical Impact

Attackers can exploit this vulnerability to read sensitive configuration files, access credentials, or potentially achieve remote code execution through log poisoning or other LFI-to-RCE techniques.

Affected Products

• ThemeREX EmojiNation WordPress Theme versions up to and including 1.0.12

Discovery Timeline

• 2026-03-05 - CVE CVE-2026-28029 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-28029

Vulnerability Analysis

This vulnerability is classified as CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). The EmojiNation WordPress theme fails to properly sanitize user-supplied input before using it in PHP file inclusion functions such as include(), include_once(), require(), or require_once().

When user-controlled input is passed directly to these PHP functions without adequate validation, an attacker can manipulate the file path to traverse directories and include files outside the intended directory. This can expose sensitive system files such as /etc/passwd, WordPress configuration files like wp-config.php, or application logs that may contain sensitive data.

Root Cause

The root cause lies in insufficient input validation and sanitization of user-controllable parameters that are subsequently used in PHP file inclusion statements. The theme does not properly restrict which files can be included, allowing path traversal sequences (such as ../) to escape the intended directory scope and access arbitrary files on the server's filesystem.

Attack Vector

The attack vector involves manipulating HTTP request parameters that control file inclusion within the EmojiNation theme. An attacker can craft malicious requests containing directory traversal sequences to include sensitive files. In more advanced scenarios, attackers may leverage this LFI vulnerability to include files containing PHP code they have previously injected (such as through log files or uploaded content), potentially escalating to remote code execution.

For detailed technical information about this vulnerability, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-28029

Indicators of Compromise

• Unusual HTTP requests containing path traversal patterns such as ../ or encoded variants (%2e%2e%2f)
• Web server access logs showing requests attempting to access sensitive files like /etc/passwd or wp-config.php
• Unexpected file access patterns in PHP error logs indicating inclusion of non-standard files

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal attempts in request parameters
• Monitor web server logs for requests containing directory traversal sequences targeting the EmojiNation theme
• Deploy file integrity monitoring to detect unauthorized reads of sensitive configuration files

Monitoring Recommendations

• Enable verbose logging for PHP include/require operations in development and staging environments
• Configure alerts for anomalous file access patterns, particularly access to system configuration files
• Regularly review web server access logs for suspicious request patterns targeting WordPress themes

How to Mitigate CVE-2026-28029

Immediate Actions Required

• Immediately deactivate the EmojiNation theme if running version 1.0.12 or earlier
• Switch to an alternative WordPress theme until a patched version is available
• Implement WAF rules to block path traversal attempts targeting WordPress themes
• Review server logs to determine if exploitation has already occurred

Patch Information

At the time of publication, no official patch has been confirmed. Organizations should monitor ThemeREX for security updates and apply patches immediately when available. Additional details can be found in the Patchstack Vulnerability Report.

Workarounds

• Implement a Web Application Firewall (WAF) with rules to block LFI attack patterns
• Apply PHP open_basedir restrictions to limit file inclusion to the WordPress directory
• Restrict file permissions on sensitive configuration files to prevent unauthorized reads
• Consider implementing a virtual patching solution until an official fix is released

# Example: Restrict PHP open_basedir in Apache configuration
<Directory /var/www/html/wordpress>
    php_admin_value open_basedir "/var/www/html/wordpress:/tmp"
</Directory>