CVE-2026-22397: Fleur Theme Path Traversal Vulnerability

CVE-2026-22397 Overview

CVE-2026-22397 is a PHP Local File Inclusion (LFI) vulnerability affecting the Fleur WordPress theme developed by Mikado-Themes. The vulnerability stems from improper control of filename for include/require statements in PHP, classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). This flaw allows attackers to include local files on the server, potentially leading to sensitive information disclosure, code execution, or further system compromise.

Critical Impact
Attackers can exploit this Local File Inclusion vulnerability to read sensitive files from the WordPress server, potentially exposing configuration files, database credentials, or other critical data. In certain configurations, this could escalate to remote code execution.

Affected Products

Mikado-Themes Fleur WordPress Theme version 2.0 and earlier
WordPress installations using the Fleur theme
All versions from initial release through version 2.0

Discovery Timeline

2026-03-05 - CVE CVE-2026-22397 published to NVD
2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-22397

Vulnerability Analysis

This vulnerability exists due to insufficient validation of user-supplied input before it is used in PHP include or require statements within the Fleur WordPress theme. The theme fails to properly sanitize file path parameters, allowing attackers to manipulate the include path to access arbitrary local files on the server.

PHP Local File Inclusion vulnerabilities occur when applications dynamically include files based on user input without proper validation. In the context of WordPress themes, this often manifests in template loading mechanisms, shortcode handlers, or AJAX endpoints that accept file parameters.

The vulnerability can be exploited without authentication in certain scenarios, depending on how the vulnerable code path is exposed. Successful exploitation allows attackers to read files outside the intended directory structure using path traversal sequences or direct file path manipulation.

Root Cause

The root cause of this vulnerability is the improper control of filename parameters passed to PHP's include(), require(), include_once(), or require_once() functions. The Fleur theme does not adequately sanitize or validate user-controlled input before using it to construct file paths for inclusion. This lack of input validation allows attackers to inject malicious file paths, potentially including sensitive system files or PHP files containing exploitable code.

Attack Vector

The attack vector for this vulnerability involves manipulating HTTP request parameters that are processed by the theme's file inclusion logic. An attacker can craft malicious requests containing path traversal sequences (such as ../) or absolute file paths to include arbitrary local files.

Common attack scenarios include:

Configuration File Disclosure: Including wp-config.php to obtain database credentials and authentication keys
Log File Poisoning: If log files contain user-controlled data, attackers may inject PHP code into logs and then include those log files to achieve code execution
Sensitive Data Exposure: Reading /etc/passwd or other system files to enumerate users and gather reconnaissance information

For technical details on this vulnerability, refer to the Patchstack WordPress Theme Vulnerability advisory.

Detection Methods for CVE-2026-22397

Indicators of Compromise

Unusual HTTP requests containing path traversal sequences such as ../, ..%2f, or encoded variants targeting the Fleur theme
Web server access logs showing attempts to access sensitive files like wp-config.php, /etc/passwd, or .htaccess through theme endpoints
Unexpected file access patterns in PHP error logs indicating inclusion of files outside normal theme directories
Presence of webshells or unauthorized PHP files if the vulnerability was escalated to code execution

Detection Strategies

Deploy Web Application Firewall (WAF) rules to detect and block path traversal patterns in requests to WordPress theme endpoints
Monitor web server logs for requests containing file inclusion patterns or references to sensitive system files
Implement file integrity monitoring on critical WordPress files and server configuration files
Use WordPress security plugins that detect LFI attempts and alert on suspicious file access patterns

Monitoring Recommendations

Enable detailed PHP error logging and monitor for include/require failures indicating exploitation attempts
Set up alerting for access to sensitive files through web server access logs
Monitor for unusual outbound connections that might indicate data exfiltration following successful exploitation
Regularly audit WordPress theme and plugin directories for unauthorized file modifications

How to Mitigate CVE-2026-22397

Immediate Actions Required

Update the Fleur WordPress theme to the latest patched version when available from Mikado-Themes
If no patch is available, consider temporarily disabling or removing the Fleur theme and switching to an alternative theme
Implement Web Application Firewall rules to block common LFI attack patterns
Review server logs for evidence of exploitation attempts and investigate any suspicious activity
Restrict file system permissions to limit the impact of potential file inclusion attacks

Patch Information

Check the Patchstack WordPress Theme Vulnerability advisory for the latest patch status and updated theme versions from Mikado-Themes. Users should update to a version greater than 2.0 when a security patch becomes available.

Workarounds

Implement server-level restrictions using open_basedir PHP configuration to limit file access to the WordPress directory
Use .htaccess rules to block requests containing path traversal sequences targeting theme endpoints
Deploy a WAF solution with rules specifically designed to detect and block PHP LFI attacks
Consider using WordPress security plugins that provide runtime protection against file inclusion vulnerabilities

bash

# Configuration example - Add to .htaccess to help mitigate LFI attempts
# Block requests containing path traversal sequences
<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{QUERY_STRING} (\.\./|\.\.%2f) [NC,OR]
    RewriteCond %{QUERY_STRING} (etc/passwd|proc/self) [NC]
    RewriteRule .* - [F,L]
</IfModule>

# PHP configuration - Add to php.ini to restrict file access
# open_basedir = /var/www/html/wordpress/