CVE-2026-22495: Greenville Theme File Inclusion Vulnerability

CVE-2026-22495 Overview

CVE-2026-22495 is a Local File Inclusion (LFI) vulnerability affecting the AncoraThemes Greenville WordPress theme. 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 can lead to unauthorized access to sensitive configuration files, source code disclosure, and potentially remote code execution when combined with other attack vectors.

Critical Impact

Unauthenticated attackers can exploit this vulnerability to read sensitive files from the server, potentially exposing database credentials, API keys, and other confidential information stored in configuration files.

Affected Products

• AncoraThemes Greenville WordPress Theme versions 1.3.2 and earlier
• WordPress installations using the Greenville theme

Discovery Timeline

• 2026-03-25 - CVE CVE-2026-22495 published to NVD
• 2026-03-26 - Last updated in NVD database

Technical Details for CVE-2026-22495

Vulnerability Analysis

This vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). The Greenville WordPress theme fails to properly sanitize user-controlled input before passing it to PHP's include() or require() functions. This allows an attacker to manipulate file path parameters to include arbitrary local files from the server's filesystem.

The vulnerability can be exploited remotely over the network, though it requires specific conditions to be met, making exploitation complexity somewhat higher. Successful exploitation does not require any privileges or user interaction, making it particularly dangerous for publicly accessible WordPress installations.

Root Cause

The root cause lies in insufficient input validation and sanitization of filename parameters within the Greenville theme's PHP code. When the theme processes certain requests, it uses user-supplied input to dynamically construct file paths for PHP include statements without adequate filtering of directory traversal sequences (such as ../) or validation against an allowlist of permitted files.

Attack Vector

The attack is network-based and requires no authentication. An attacker can craft malicious HTTP requests containing directory traversal sequences to navigate outside the intended directory structure and include sensitive files. Common targets include:

• /etc/passwd - System user information
• wp-config.php - WordPress database credentials
• .htaccess - Server configuration files
• PHP session files - For session hijacking
• Log files - For log poisoning attacks that can escalate to RCE

When combined with file upload functionality or log poisoning techniques, this LFI vulnerability can potentially be escalated to remote code execution. The vulnerability mechanism involves manipulating path parameters to traverse directories and include files outside the theme's intended scope. For detailed technical analysis, refer to the Patchstack security advisory.

Detection Methods for CVE-2026-22495

Indicators of Compromise

• Unusual HTTP requests containing directory traversal patterns (../, ..%2f, %2e%2e/) targeting theme files
• Access log entries showing attempts to include system files like /etc/passwd or wp-config.php
• Unexpected file read operations by the web server process outside the WordPress directory
• Error log entries indicating failed file inclusion attempts

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block directory traversal patterns in HTTP requests
• Monitor web server access logs for requests containing path manipulation sequences targeting the Greenville theme
• Deploy file integrity monitoring to detect unauthorized access to sensitive configuration files
• Configure intrusion detection systems to alert on LFI exploitation patterns

Monitoring Recommendations

• Enable verbose logging for the WordPress installation and web server
• Monitor for abnormal file access patterns, particularly reads of files outside the web root
• Set up alerts for requests containing encoded traversal sequences (%2e, %2f, %00)
• Review PHP error logs for include/require failures that may indicate exploitation attempts

How to Mitigate CVE-2026-22495

Immediate Actions Required

• Update the Greenville theme to the latest patched version if available from AncoraThemes
• Implement input validation at the server level to block directory traversal attempts
• Configure web server to restrict PHP file operations to the WordPress directory
• Consider temporarily disabling the theme if no patch is available and the site is critical

Patch Information

The vulnerability affects Greenville theme versions through 1.3.2. Site administrators should check the Patchstack advisory for updates on patch availability. Contact AncoraThemes directly for information about security updates.

Workarounds

• Deploy a Web Application Firewall with rules to block LFI attack patterns
• Use PHP's open_basedir directive to restrict file operations to the WordPress installation directory
• Implement file path validation using a whitelist approach for any dynamic file includes
• Consider switching to an alternative WordPress theme until a security patch is released

# PHP configuration to restrict file operations (php.ini or .htaccess)
# Restrict PHP file operations to WordPress directory
php_admin_value open_basedir /var/www/html/wordpress/

# Apache mod_rewrite rules to block directory traversal
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.%2f) [NC,OR]
RewriteCond %{QUERY_STRING} (etc/passwd|wp-config\.php) [NC]
RewriteRule .* - [F,L]