CVE-2026-28064: Edge Decor LFI Vulnerability in WordPress

CVE-2026-28064 Overview

CVE-2026-28064 is a PHP Local File Inclusion (LFI) vulnerability affecting the ThemeREX Edge Decor WordPress theme. This vulnerability stems from improper control of filename parameters used in PHP include/require statements, allowing attackers to include arbitrary local files from the server. The vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program).

Critical Impact

Successful exploitation could allow unauthenticated remote attackers to read sensitive server files, potentially leading to information disclosure, credential theft, or further system compromise through chained attacks.

Affected Products

• ThemeREX Edge Decor WordPress Theme version 2.2 and earlier
• WordPress installations running vulnerable Edge Decor theme versions

Discovery Timeline

• 2026-03-05 - CVE-2026-28064 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-28064

Vulnerability Analysis

This vulnerability affects the Edge Decor WordPress theme developed by ThemeREX. The flaw exists due to improper validation and sanitization of user-controlled input that is subsequently used in PHP include() or require() statements. When exploited, this Local File Inclusion vulnerability allows attackers to manipulate file path parameters to include arbitrary files from the local file system.

The vulnerability can be exploited remotely over the network without requiring authentication, though successful exploitation requires certain conditions to be met regarding attack complexity. An attacker who successfully exploits this vulnerability can potentially read sensitive configuration files, access database credentials stored in wp-config.php, view server logs, or include other sensitive files that may lead to further compromise.

Root Cause

The root cause of CVE-2026-28064 is insufficient input validation in the Edge Decor theme's PHP code. The theme fails to properly sanitize or validate user-supplied input before using it in file inclusion operations. This allows attackers to inject path traversal sequences (such as ../) or specify absolute paths to include unintended files from the server's file system.

Attack Vector

The attack vector for this vulnerability is network-based, meaning attackers can exploit it remotely without requiring local access to the target system. The exploitation involves crafting malicious HTTP requests that manipulate parameters used in PHP file inclusion operations. By injecting path traversal sequences or specially crafted file paths, an attacker can force the application to include local files outside the intended directory scope.

Typical exploitation scenarios include:

• Reading the WordPress configuration file (wp-config.php) to obtain database credentials
• Accessing /etc/passwd or other system files on Linux servers
• Including log files that may contain sensitive information
• Chaining with log poisoning techniques to achieve remote code execution

For detailed technical analysis and exploitation patterns, see the Patchstack security advisory.

Detection Methods for CVE-2026-28064

Indicators of Compromise

• Unusual HTTP requests containing path traversal sequences (../, ..%2f, ..%252f) targeting theme-related endpoints
• Web server logs showing attempts to access sensitive files like wp-config.php, /etc/passwd, or /etc/shadow
• Requests with encoded or obfuscated directory traversal patterns in URL parameters
• Unexpected file access events in PHP or web server error logs

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block path traversal attempts and LFI attack patterns
• Monitor HTTP request logs for suspicious parameters containing path traversal sequences or references to sensitive system files
• Deploy intrusion detection systems (IDS) with signatures for PHP LFI exploitation attempts
• Enable detailed PHP error logging and monitor for file inclusion-related warnings or errors

Monitoring Recommendations

• Configure real-time alerting for any requests containing path traversal patterns targeting WordPress theme directories
• Implement file integrity monitoring on critical WordPress files including wp-config.php
• Monitor web server access logs for requests to the Edge Decor theme endpoints with unusual parameter values
• Review authentication logs for any anomalous access patterns following potential LFI exploitation

How to Mitigate CVE-2026-28064

Immediate Actions Required

• Identify all WordPress installations using the ThemeREX Edge Decor theme version 2.2 or earlier
• Consider temporarily disabling or replacing the vulnerable theme until a patched version is available
• Implement WAF rules to block path traversal and LFI attack patterns
• Review web server logs for any signs of exploitation attempts

Patch Information

At the time of publication, users should consult the Patchstack vulnerability database for the latest patch availability and update information from ThemeREX. Organizations should monitor for theme updates and apply security patches as soon as they become available.

Workarounds

• Implement strict input validation rules at the web server or WAF level to block requests containing path traversal sequences
• Restrict PHP's open_basedir directive to limit which directories PHP can access for file operations
• Disable the vulnerable theme and use an alternative until a security patch is released
• Apply the principle of least privilege to web server file permissions, ensuring sensitive files are not readable by the web server process

# Example: Restrict PHP open_basedir in php.ini or .htaccess
# Add to php.ini:
open_basedir = /var/www/html:/tmp

# Or add to .htaccess:
php_admin_value open_basedir "/var/www/html:/tmp"

# Set restrictive file permissions on sensitive files
chmod 600 /var/www/html/wp-config.php
chown www-data:www-data /var/www/html/wp-config.php