CVE-2026-22389: Mikado Cocco Theme File Inclusion Flaw

CVE-2026-22389 Overview

CVE-2026-22389 is a PHP Local File Inclusion (LFI) vulnerability affecting the Cocco WordPress theme by Mikado-Themes. The vulnerability stems from improper control of filename parameters used in include/require statements within the PHP application. This flaw allows attackers to manipulate file paths and include local files from the server, potentially leading to sensitive information disclosure, configuration file exposure, or in some scenarios, remote code execution when combined with other techniques.

Critical Impact

Attackers can exploit this Local File Inclusion vulnerability to read sensitive server files, potentially exposing database credentials, configuration data, and other critical system information from WordPress installations using the Cocco theme.

Affected Products

• Mikado-Themes Cocco WordPress Theme version 1.5.1 and earlier
• WordPress installations using vulnerable Cocco theme versions
• All Cocco theme versions from initial release through <= 1.5.1

Discovery Timeline

• 2026-03-05 - CVE-2026-22389 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-22389

Vulnerability Analysis

This vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). The Cocco WordPress theme fails to properly sanitize or validate user-supplied input before using it in PHP include(), require(), include_once(), or require_once() statements. This improper input handling allows attackers to traverse directory structures and include arbitrary local files present on the server.

Local File Inclusion vulnerabilities in WordPress themes are particularly dangerous because they can expose the wp-config.php file containing database credentials, authentication keys, and salts. Additionally, attackers may be able to read /etc/passwd on Linux servers, access log files, or include uploaded files containing malicious PHP code if such files exist on the system.

Root Cause

The root cause of this vulnerability lies in insufficient input validation within the Cocco theme's PHP codebase. When the theme processes user-controllable parameters that determine which files to include, it fails to implement proper sanitization measures such as:

• Whitelisting allowed file paths or filenames
• Stripping directory traversal sequences (e.g., ../)
• Validating that included files exist within expected directories
• Using basename filtering to prevent path manipulation

This allows attackers to escape the intended directory context and reference files elsewhere on the filesystem.

Attack Vector

The attack vector involves manipulating HTTP request parameters that are passed to PHP include functions within the theme. An attacker can craft malicious requests containing directory traversal sequences such as ../ to navigate outside the web root and access sensitive system files.

A typical exploitation scenario involves identifying a vulnerable parameter in the theme, then modifying its value to traverse directories and include sensitive files. For example, an attacker might attempt to include ../../wp-config.php or ../../../../etc/passwd depending on the server configuration and the location of the vulnerable code.

The exploitation does not require authentication in many LFI scenarios, making this vulnerability accessible to unauthenticated remote attackers. For detailed technical information about this vulnerability, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-22389

Indicators of Compromise

• Unusual HTTP requests containing directory traversal patterns (../, ..%2f, %2e%2e/) targeting the Cocco theme
• Web server logs showing access attempts to /wp-content/themes/cocco/ with suspicious parameter values
• Error log entries indicating failed file inclusion attempts or path-related warnings
• Requests attempting to access sensitive files like wp-config.php, /etc/passwd, or log files through theme parameters

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block requests containing directory traversal sequences
• Monitor web server access logs for patterns indicative of LFI exploitation attempts
• Deploy intrusion detection systems with signatures for PHP file inclusion attacks
• Regularly audit installed WordPress themes and compare file hashes against known-good versions

Monitoring Recommendations

• Enable verbose logging for WordPress and web server to capture detailed request information
• Set up alerting for requests to the Cocco theme containing suspicious characters or encoding
• Monitor for unexpected file access patterns in system audit logs
• Implement real-time security monitoring for file system access anomalies

How to Mitigate CVE-2026-22389

Immediate Actions Required

• Update the Cocco WordPress theme to the latest patched version if available from Mikado-Themes
• If no patch is available, consider temporarily disabling or replacing the Cocco theme
• Implement WAF rules to block directory traversal attempts targeting theme files
• Audit server logs for signs of previous exploitation attempts
• Review and restrict file permissions on sensitive configuration files

Patch Information

Users should check the Mikado-Themes website or official distribution channels for an updated version of the Cocco theme that addresses this vulnerability. The Patchstack Vulnerability Report may contain additional remediation guidance. Until a patch is applied, implement compensating security controls.

Workarounds

• Deploy a Web Application Firewall with rules blocking LFI attack patterns
• Switch to an alternative WordPress theme that is actively maintained and patched
• Implement server-side restrictions to limit PHP's ability to include files outside designated directories
• Use PHP configuration options like open_basedir to restrict file access scope
• Consider implementing additional input validation at the web server level using mod_security or similar tools

# Example Apache mod_rewrite rules to block directory traversal attempts
# Add to .htaccess in WordPress root

RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.%2f|%2e%2e/) [NC,OR]
RewriteCond %{REQUEST_URI} (\.\./|\.\.%2f|%2e%2e/) [NC]
RewriteRule .* - [F,L]

# PHP open_basedir configuration (add to php.ini or .htaccess)
# Restricts PHP file operations to specified directories
# php_admin_value open_basedir /var/www/html:/tmp