CVE-2026-27997: Maxify Theme File Inclusion Vulnerability

CVE-2026-27997 Overview

CVE-2026-27997 is a PHP Local File Inclusion (LFI) vulnerability affecting the ThemeREX Maxify WordPress theme. This vulnerability stems from improper control of filename parameters used in PHP include/require statements, allowing attackers to include arbitrary local files from the server filesystem.

The vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program), which describes scenarios where user-controlled input is passed directly to file inclusion functions without proper validation or sanitization.

Critical Impact
Successful exploitation allows attackers to read sensitive files from the server, potentially exposing configuration files, database credentials, and other confidential data. In some cases, LFI can be chained with other vulnerabilities to achieve remote code execution.

Affected Products

ThemeREX Maxify WordPress Theme versions through 1.0.16
WordPress installations using the vulnerable Maxify theme
Web servers hosting affected WordPress sites

Discovery Timeline

2026-03-05 - CVE-2026-27997 published to NVD
2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-27997

Vulnerability Analysis

This Local File Inclusion vulnerability exists in the ThemeREX Maxify WordPress theme due to insufficient input validation when handling file paths in PHP include or require statements. The vulnerability allows an attacker to manipulate file path parameters to include arbitrary files from the local filesystem.

LFI vulnerabilities in WordPress themes typically occur when theme template files accept user-supplied input to dynamically load template parts, configuration files, or other PHP resources. Without proper validation, attackers can traverse directories using sequences like ../ to access files outside the intended directory structure.

Root Cause

The root cause is improper sanitization of user-controlled input before it is used in PHP file inclusion functions (include, include_once, require, require_once). The Maxify theme fails to adequately validate or sanitize filename parameters, allowing path traversal sequences and unauthorized file access.

Common vulnerable code patterns include:

Direct use of $_GET, $_POST, or $_REQUEST parameters in include statements
Insufficient path canonicalization before file inclusion
Missing whitelist validation for allowed file paths
Failure to restrict included files to specific directories

Attack Vector

Attackers can exploit this vulnerability by crafting malicious requests that manipulate the vulnerable parameter to include sensitive local files. Typical attack scenarios involve:

Path traversal attacks allow attackers to navigate outside the web root directory to access system files such as /etc/passwd on Linux systems or configuration files like wp-config.php that contain database credentials. The attacker constructs a request with directory traversal sequences to escape the intended include directory and reference arbitrary files on the system.

In more advanced exploitation scenarios, attackers may combine LFI with log poisoning or other techniques to achieve remote code execution. By injecting PHP code into log files and then including those logs via the LFI vulnerability, attackers can execute arbitrary commands on the server.

For detailed technical information, see the Patchstack Maxify Theme Vulnerability advisory.

Detection Methods for CVE-2026-27997

Indicators of Compromise

Unusual HTTP requests containing path traversal sequences (../, ..%2f, ..%5c) targeting theme files
Access logs showing requests for sensitive files such as /etc/passwd or wp-config.php through theme endpoints
Error logs indicating failed file inclusion attempts with unusual file paths
Web application firewall alerts for LFI attack patterns

Detection Strategies

Deploy web application firewall (WAF) rules to detect and block path traversal patterns in HTTP requests
Monitor access logs for requests containing encoded directory traversal sequences or references to sensitive system files
Implement file integrity monitoring on WordPress theme directories to detect unauthorized modifications
Use security scanning tools to identify vulnerable WordPress themes and plugins

Monitoring Recommendations

Enable detailed logging for the WordPress installation and review logs regularly for suspicious activity
Configure real-time alerting for HTTP requests matching known LFI attack signatures
Monitor server file access patterns for unusual read operations on configuration or system files
Deploy endpoint detection and response (EDR) solutions to detect post-exploitation activities

How to Mitigate CVE-2026-27997

Immediate Actions Required

Update the ThemeREX Maxify theme to a patched version if available from the vendor
Temporarily deactivate the Maxify theme and switch to a default WordPress theme until a patch is applied
Implement web application firewall rules to block path traversal attack patterns
Review server access logs for evidence of exploitation attempts
Audit WordPress installations for other potentially vulnerable themes and plugins

Patch Information

As of the last NVD update on 2026-03-05, organizations should check the Patchstack advisory for the latest patch information and remediation guidance from ThemeREX.

Site administrators should update the Maxify theme to a version greater than 1.0.16 once a security patch is released by the vendor. Ensure automatic updates are enabled for WordPress themes to receive future security patches promptly.

Workarounds

Configure the web server to restrict PHP file inclusion to specific whitelisted directories using open_basedir directive
Deploy a web application firewall with rules to detect and block LFI attack patterns
Implement custom input validation in WordPress using security plugins like Wordfence or Sucuri
Remove or deactivate the vulnerable theme until an official patch is available
Apply PHP hardening configurations to limit the impact of file inclusion vulnerabilities

bash

# PHP configuration hardening in php.ini
# Restrict file inclusion to specific directories
open_basedir = /var/www/html:/tmp

# Disable dangerous functions that could be chained with LFI
disable_functions = exec,passthru,shell_exec,system,proc_open,popen

# Enable logging for security monitoring
log_errors = On
error_log = /var/log/php_errors.log