CVE-2026-22402: Triply Plugin File Inclusion Vulnerability

CVE-2026-22402 Overview

CVE-2026-22402 is a PHP Local File Inclusion (LFI) vulnerability affecting the Triply WordPress theme developed by pavothemes. The vulnerability stems from improper control of filename for include/require statements in PHP, allowing attackers to include local files from the server filesystem. This type of vulnerability (CWE-98) can enable attackers to read sensitive configuration files, expose source code, and potentially achieve remote code execution if combined with other techniques such as log poisoning or file upload vulnerabilities.

Critical Impact

Successful exploitation could allow attackers to read sensitive files including wp-config.php, access database credentials, and potentially escalate to remote code execution through log poisoning or PHP wrapper abuse.

Affected Products

• Triply WordPress Theme version 2.4.7 and earlier
• All versions from initial release through 2.4.7

Discovery Timeline

• January 22, 2026 - CVE-2026-22402 published to NVD
• January 22, 2026 - Last updated in NVD database

Technical Details for CVE-2026-22402

Vulnerability Analysis

This vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). The Triply WordPress theme fails to properly sanitize user-supplied input before passing it to PHP include or require functions. This allows an attacker to manipulate the file path parameter to include arbitrary local files from the server's filesystem.

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 leverage PHP wrappers such as php://filter to read and encode source code, or combine the LFI with log poisoning techniques to achieve remote code execution.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and sanitization within the Triply theme's PHP code. When the theme processes user-controlled parameters for file inclusion operations, it fails to properly restrict the allowed file paths or validate that the requested file is within an expected directory. This allows directory traversal sequences (such as ../) or direct paths to be injected, enabling access to files outside the intended scope.

Attack Vector

An attacker can exploit this vulnerability by crafting malicious requests that manipulate file path parameters processed by the vulnerable theme component. The attack typically involves:

1. Identifying the vulnerable parameter that accepts file path input
2. Injecting directory traversal sequences or PHP wrappers to access sensitive files
3. Reading configuration files, source code, or system files
4. Potentially escalating to remote code execution through techniques like log poisoning or session file inclusion

The vulnerability can be exploited remotely without authentication in certain scenarios, depending on where the vulnerable code is exposed within the theme's functionality. For detailed technical information, see the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-22402

Indicators of Compromise

• Unusual HTTP requests containing directory traversal patterns such as ../, ..%2f, or encoded variants targeting theme endpoints
• Access log entries showing attempts to include sensitive files like /etc/passwd, wp-config.php, or log files
• Requests containing PHP wrapper protocols such as php://filter, php://input, or data:// in URL parameters
• Unexpected file access patterns in web server logs targeting the Triply theme directory

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block directory traversal patterns and PHP wrapper abuse attempts
• Monitor access logs for requests containing suspicious file path patterns targeting /wp-content/themes/triply/
• Configure intrusion detection systems (IDS) to alert on LFI attack signatures
• Regularly audit WordPress theme files for unauthorized modifications

Monitoring Recommendations

• Enable verbose logging for PHP file inclusion operations to track potential exploitation attempts
• Set up real-time alerting for access to sensitive configuration files like wp-config.php
• Monitor for unusual process spawning from the web server that could indicate successful code execution
• Implement file integrity monitoring on critical WordPress configuration files

How to Mitigate CVE-2026-22402

Immediate Actions Required

• Update the Triply theme to the latest patched version as soon as a fix becomes available from pavothemes
• If no patch is available, consider temporarily disabling or replacing the Triply theme
• Implement WAF rules to block common LFI attack patterns targeting the theme
• Restrict file system permissions to limit the web server's access to sensitive files

Patch Information

Users should monitor the pavothemes vendor channels and the Patchstack vulnerability database for updates regarding security patches. Update the Triply theme to a version newer than 2.4.7 once a patched release becomes available.

Workarounds

• Deploy a Web Application Firewall (WAF) with rules specifically designed to block directory traversal and PHP wrapper injection attempts
• Disable or remove the Triply theme if it is not essential to site functionality until a patch is released
• Implement PHP open_basedir restrictions to limit file access to the WordPress installation directory
• Consider using a virtual patching solution through security plugins like Patchstack or Wordfence to protect against exploitation

# Example PHP configuration to restrict file access
# Add to php.ini or .htaccess to limit include paths
open_basedir = /var/www/html/wordpress/

# Apache mod_rewrite rules to block common LFI patterns
# Add to .htaccess in WordPress root
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.%2f) [NC,OR]
RewriteCond %{QUERY_STRING} (php://|data://) [NC]
RewriteRule .* - [F,L]