CVE-2026-22457: Wanderland Theme File Inclusion Flaw

CVE-2026-22457 Overview

CVE-2026-22457 is a Local File Inclusion (LFI) vulnerability affecting the Wanderland WordPress theme developed by Mikado-Themes. The vulnerability stems from improper control of filename parameters used in PHP include/require statements, classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program).

This vulnerability allows attackers to include arbitrary local files from the server's file system through manipulated input parameters. When successfully exploited, attackers can potentially read sensitive configuration files, access credentials stored on the server, or chain this vulnerability with other techniques to achieve remote code execution.

Critical Impact

Attackers can leverage this LFI vulnerability to read sensitive server files including wp-config.php, potentially exposing database credentials and authentication keys, or chain with log poisoning techniques for code execution.

Affected Products

• Mikado-Themes Wanderland WordPress Theme version 1.5 and earlier
• All WordPress installations using vulnerable versions of the Wanderland theme

Discovery Timeline

• 2026-03-05 - CVE-2026-22457 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-22457

Vulnerability Analysis

The Wanderland WordPress theme by Mikado-Themes contains an Improper Control of Filename for Include/Require Statement vulnerability. This flaw occurs when user-supplied input is passed directly to PHP's include(), require(), include_once(), or require_once() functions without proper validation or sanitization.

PHP file inclusion vulnerabilities are particularly dangerous in WordPress environments because the application often has access to sensitive configuration files and may run with elevated filesystem permissions. An attacker exploiting this vulnerability can traverse the directory structure using path manipulation sequences to access files outside the intended directory scope.

The vulnerability affects all versions of the Wanderland theme from initial release through version 1.5. WordPress themes commonly implement dynamic template loading functionality, and when this functionality lacks proper input validation, it creates opportunities for file inclusion attacks.

Root Cause

The root cause of this vulnerability is the failure to properly sanitize or validate user-controlled input before using it in PHP file inclusion statements. The affected code likely accepts a filename or path parameter from user input (such as GET/POST parameters, cookies, or other controllable sources) and passes it directly to a PHP include function.

Secure implementations should employ allowlisting of permitted files, strip directory traversal sequences, validate file extensions, and ensure the resolved path remains within expected directories using functions like realpath() combined with prefix checking.

Attack Vector

The attack vector for this LFI vulnerability involves manipulating input parameters to include arbitrary files from the local filesystem. Attackers typically craft requests containing directory traversal sequences (such as ../) to escape the intended directory and access sensitive files elsewhere on the server.

Common exploitation targets in WordPress environments include:

• /wp-config.php - Contains database credentials and authentication keys
• /etc/passwd - User enumeration on Linux systems
• Log files - Can be poisoned and then included to achieve code execution
• Other PHP files - May contain additional sensitive information or be leveraged for further attacks

When combined with techniques such as log poisoning, PHP filter wrappers, or proc/self/environ injection, LFI vulnerabilities can potentially be escalated to achieve Remote Code Execution (RCE).

Detection Methods for CVE-2026-22457

Indicators of Compromise

• Unusual HTTP requests containing directory traversal patterns (../, ..%2f, ..%252f) in URL parameters targeting the Wanderland theme
• Access log entries showing attempts to include sensitive files like wp-config.php, /etc/passwd, or system log files
• PHP error logs containing warnings about failed file inclusions or path-related errors

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block requests containing path traversal sequences
• Monitor server access logs for suspicious patterns targeting theme files with unusual parameters
• Deploy file integrity monitoring to detect unauthorized access to sensitive configuration files
• Enable PHP error logging and monitor for file inclusion-related warnings

Monitoring Recommendations

• Configure real-time alerting for access log entries containing common LFI patterns
• Monitor WordPress theme directories for unexpected file access patterns
• Implement endpoint detection and response (EDR) solutions to detect post-exploitation activities
• Regularly review authentication logs for unauthorized access following potential exploitation attempts

How to Mitigate CVE-2026-22457

Immediate Actions Required

• Update the Wanderland theme to the latest patched version as soon as available from Mikado-Themes
• Review server access logs for evidence of exploitation attempts
• Implement WAF rules to block path traversal attempts targeting the theme
• Consider temporarily disabling the Wanderland theme if a patch is not yet available

Patch Information

Organizations using the Wanderland WordPress theme should monitor the Patchstack WordPress Vulnerability Report for updated information regarding available patches. Contact Mikado-Themes directly for patch availability and upgrade instructions.

Ensure your WordPress installation and all plugins are updated to their latest versions, as defense-in-depth measures can help mitigate the impact of theme-level vulnerabilities.

Workarounds

• Implement server-level restrictions using .htaccess or web server configuration to block requests containing path traversal sequences
• Deploy a Web Application Firewall (WAF) with rules specifically targeting LFI patterns
• Restrict PHP's open_basedir directive to limit file inclusion to specific directories
• Consider implementing WordPress hardening plugins that provide additional security layers

# Apache .htaccess rule to block common LFI patterns
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.) [NC,OR]
RewriteCond %{QUERY_STRING} (\.%2e|%2e\.) [NC]
RewriteRule ^(.*)$ - [F,L]