CVE-2026-22403: Innovio Theme File Inclusion Vulnerability

CVE-2026-22403 Overview

CVE-2026-22403 is a PHP Local File Inclusion (LFI) vulnerability affecting the Innovio WordPress theme developed by Mikado-Themes. The vulnerability stems from improper control of filename for include/require statements in PHP, allowing attackers to include local files from the server. This type of vulnerability (classified as CWE-98) can lead to sensitive information disclosure, code execution, or further system compromise.

Critical Impact
Attackers can exploit this Local File Inclusion vulnerability to read sensitive server files, potentially accessing configuration files, credentials, or executing arbitrary PHP code through log poisoning or other advanced techniques.

Affected Products

Mikado-Themes Innovio WordPress Theme version 1.7 and earlier
All WordPress installations running vulnerable Innovio theme versions
WordPress environments with default or misconfigured file permissions

Discovery Timeline

2026-03-05 - CVE CVE-2026-22403 published to NVD
2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-22403

Vulnerability Analysis

This vulnerability exists due to improper validation and sanitization of user-controlled input that is subsequently used in PHP include or require statements within the Innovio theme. When a web application dynamically includes files based on user input without proper validation, attackers can manipulate the file path to include unintended local files from the server's filesystem.

The Local File Inclusion vulnerability allows an attacker to traverse the directory structure and access files outside the intended scope. This can expose sensitive configuration files such as wp-config.php, /etc/passwd on Linux systems, or log files that may contain valuable information for further attacks.

Root Cause

The root cause of this vulnerability is the failure to properly sanitize and validate user-supplied input before using it in file inclusion operations. The Innovio theme likely uses dynamic file inclusion to load template parts or components, but does not adequately filter path traversal sequences (such as ../) or restrict the includable file paths to a safe whitelist.

Attack Vector

An attacker can exploit this vulnerability by crafting malicious HTTP requests that include path traversal sequences in parameters that are processed by the vulnerable file inclusion logic. By manipulating these parameters, the attacker can navigate outside the intended directory and include arbitrary local files.

The attack typically involves:

Identifying input parameters that control file inclusion
Injecting path traversal sequences to escape the intended directory
Specifying a target file path to include sensitive server files
Potentially chaining with other vulnerabilities for code execution

For detailed technical information about this vulnerability, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2026-22403

Indicators of Compromise

Unusual HTTP requests containing path traversal sequences (../, ..%2f, ....//) targeting WordPress theme files
Access log entries showing attempts to access sensitive files like /etc/passwd or wp-config.php through theme parameters
Error logs indicating file inclusion failures or warnings related to the Innovio theme
Unexpected file access patterns in WordPress theme directories

Detection Strategies

Implement Web Application Firewall (WAF) rules to detect and block path traversal patterns in request parameters
Monitor server access logs for suspicious requests containing directory traversal sequences targeting the Innovio theme
Deploy file integrity monitoring on critical WordPress and system configuration files
Use WordPress security plugins that can detect and alert on LFI attack attempts

Monitoring Recommendations

Enable detailed logging for PHP include/require operations and review for anomalous file paths
Set up alerts for access attempts to sensitive system files from web application contexts
Monitor for unusual patterns in HTTP request parameters, particularly those with encoded path traversal sequences
Implement real-time log analysis to detect exploitation attempts against WordPress themes

How to Mitigate CVE-2026-22403

Immediate Actions Required

Update the Mikado-Themes Innovio theme to a patched version when available
If no patch is available, consider temporarily disabling or replacing the vulnerable theme
Implement WAF rules to block path traversal attack patterns
Restrict file permissions on sensitive configuration files to limit exposure
Review and audit other installed themes and plugins for similar vulnerabilities

Patch Information

Organizations should monitor the Mikado-Themes vendor for an official security patch addressing this vulnerability. The Patchstack WordPress Vulnerability Report provides additional details about the vulnerability and potential remediation steps. Until an official patch is released, implement the workarounds and mitigations described below.

Workarounds

Deploy a Web Application Firewall with rules specifically targeting LFI/path traversal attacks
Implement open_basedir PHP configuration to restrict file access to the WordPress directory
Use file inclusion whitelisting where possible in custom code modifications
Consider switching to an alternative theme if the vulnerability remains unpatched
Apply the principle of least privilege to file system permissions

bash

# Configuration example
# Add to .htaccess to help block path traversal attempts
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.|%2e){2,}(/|%2f|\\|%5c) [NC,OR]
RewriteCond %{QUERY_STRING} (etc/passwd|wp-config\.php) [NC]
RewriteRule .* - [F,L]

# PHP configuration - add to php.ini or .user.ini
# Restrict file operations to WordPress directory
# open_basedir = /var/www/html/wordpress/