CVE-2026-22439: Green Planet Theme LFI Vulnerability

CVE-2026-22439 Overview

CVE-2026-22439 is an Improper Control of Filename for Include/Require Statement in PHP Program vulnerability affecting the AncoraThemes Green Planet WordPress theme. This Local File Inclusion (LFI) vulnerability allows attackers to manipulate PHP include/require statements to access arbitrary files on the server, potentially leading to sensitive information disclosure or code execution.

Critical Impact

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

Affected Products

• AncoraThemes Green Planet WordPress Theme versions through 1.1.14

Discovery Timeline

• 2026-03-05 - CVE CVE-2026-22439 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-22439

Vulnerability Analysis

This vulnerability stems from improper sanitization of user-controlled input that is subsequently used in PHP's file inclusion functions (include, include_once, require, or require_once). The Green Planet WordPress theme fails to adequately validate or sanitize parameters before incorporating them into file path operations, allowing attackers to traverse directory structures and include arbitrary local files.

Local File Inclusion vulnerabilities in WordPress themes are particularly dangerous because they can expose sensitive configuration files such as wp-config.php, which contains database credentials, authentication keys, and other security-sensitive information. Additionally, when combined with techniques like log poisoning or file upload functionality, LFI vulnerabilities can be escalated to achieve remote code execution.

Root Cause

The root cause is classified as CWE-98: Improper Control of Filename for Include/Require Statement in PHP Program. The vulnerability exists because user-supplied input is passed directly to PHP include functions without proper validation, sanitization, or path restriction. The theme code lacks adequate checks to ensure that only intended files within designated directories can be included.

Attack Vector

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

The vulnerability can be exploited remotely through crafted HTTP requests to the affected WordPress installation. No authentication may be required depending on where the vulnerable code is triggered within the theme. For detailed technical information, refer to the Patchstack vulnerability database entry.

Detection Methods for CVE-2026-22439

Indicators of Compromise

• Unusual requests containing directory traversal patterns (../, ..%2f, %2e%2e/) in URL parameters
• Web server access logs showing requests attempting to access sensitive files like /etc/passwd or wp-config.php
• Error logs indicating failed file inclusion attempts with unexpected path references
• Anomalous GET or POST parameters containing file path references to the Green Planet theme

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block directory traversal patterns in requests
• Monitor web server logs for requests containing LFI payload patterns targeting the Green Planet theme
• Deploy file integrity monitoring to detect unauthorized access to sensitive configuration files
• Use SentinelOne Singularity Platform to detect post-exploitation activities resulting from successful LFI attacks

Monitoring Recommendations

• Enable detailed logging on the WordPress installation and web server to capture request parameters
• Configure alerting for access attempts to sensitive files outside the web root
• Monitor for unusual PHP process behavior that may indicate successful file inclusion exploitation
• Review access logs for requests targeting theme files with suspicious parameter values

How to Mitigate CVE-2026-22439

Immediate Actions Required

• Update the Green Planet WordPress theme to a patched version as soon as one becomes available from AncoraThemes
• If no patch is available, consider temporarily deactivating the Green Planet theme and switching to an alternative
• Implement WAF rules to block requests containing directory traversal sequences
• Restrict file system permissions to limit the impact of potential exploitation
• Review and audit other themes and plugins for similar vulnerabilities

Patch Information

Organizations should monitor the AncoraThemes website and WordPress theme repository for security updates addressing this vulnerability. The vulnerability affects Green Planet theme versions through 1.1.14. Consult the Patchstack advisory for the latest patch status and remediation guidance.

Workarounds

• Deploy a Web Application Firewall with rules to block path traversal attempts
• Implement server-level restrictions using open_basedir PHP directive to limit file access
• Use .htaccess rules to block suspicious request patterns targeting theme files
• Consider using a virtual patching solution until an official patch is released

# Apache .htaccess example to block common LFI patterns
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./) [NC,OR]
RewriteCond %{QUERY_STRING} (etc/passwd) [NC,OR]
RewriteCond %{QUERY_STRING} (wp-config\.php) [NC]
RewriteRule ^(.*)$ - [F,L]

# PHP open_basedir restriction in php.ini
# open_basedir = /var/www/html/:/tmp/