CVE-2026-39611: KuteShop Path Traversal Vulnerability

CVE-2026-39611 Overview

CVE-2026-39611 is a Local File Inclusion (LFI) vulnerability affecting the KuteShop WordPress theme developed by kutethemes. 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 information disclosure, code execution, or further system compromise.

Critical Impact

Attackers can exploit this LFI vulnerability to read sensitive files from the server, potentially accessing configuration files, credentials, or other sensitive data stored on the WordPress installation.

Affected Products

• KuteShop WordPress Theme versions up to and including 4.2.9
• WordPress installations using the vulnerable KuteShop theme
• Websites with kutethemes KuteShop theme deployed

Discovery Timeline

• April 8, 2026 - CVE-2026-39611 published to NVD
• April 8, 2026 - Last updated in NVD database

Technical Details for CVE-2026-39611

Vulnerability Analysis

This vulnerability is categorized as CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). While the CWE title references "PHP Remote File Inclusion," the actual manifestation in KuteShop allows for Local File Inclusion. The vulnerability exists because the theme fails to properly validate or sanitize user-supplied input before using it in PHP's include(), require(), include_once(), or require_once() functions.

Local File Inclusion vulnerabilities in WordPress themes are particularly dangerous as they can provide attackers access to sensitive WordPress configuration files such as wp-config.php, which contains database credentials and authentication keys. Additionally, when combined with other attack vectors such as log poisoning or file upload vulnerabilities, LFI can be escalated to achieve Remote Code Execution.

Root Cause

The root cause of this vulnerability lies in insufficient input validation within the KuteShop theme. User-controllable input is passed directly to PHP file inclusion functions without proper sanitization or path restriction. This allows an attacker to manipulate file paths using directory traversal sequences (such as ../) to access files outside the intended directory structure.

WordPress themes that dynamically include template files or component modules based on user input are particularly susceptible to this class of vulnerability when proper input validation is not implemented.

Attack Vector

The attack vector for this vulnerability involves manipulating parameters that are passed to file inclusion functions within the KuteShop theme. An attacker can craft malicious requests containing directory traversal sequences to navigate outside the theme directory and access arbitrary files on the server.

A typical exploitation scenario involves an attacker identifying a vulnerable parameter in the theme's request handling, then using path traversal sequences like ../../ to navigate to sensitive system files such as /etc/passwd on Linux servers or WordPress configuration files.

For detailed technical analysis and exploitation information, refer to the Patchstack vulnerability database entry.

Detection Methods for CVE-2026-39611

Indicators of Compromise

• Web server access logs containing directory traversal sequences (../, ..%2f, ..%252f) in requests targeting the KuteShop theme
• Unexpected file read operations in PHP or web server error logs
• Access attempts to sensitive files like wp-config.php, /etc/passwd, or .htaccess through theme endpoints
• Anomalous requests with encoded path traversal patterns targeting theme directories

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal patterns in HTTP requests
• Monitor web server logs for requests containing ../ sequences or URL-encoded variants targeting the KuteShop theme directory
• Deploy file integrity monitoring on critical WordPress configuration files
• Utilize SentinelOne's Singularity platform to detect anomalous file access patterns indicative of LFI exploitation

Monitoring Recommendations

• Enable verbose logging for the WordPress installation and review logs for suspicious file inclusion attempts
• Configure alerting for access to sensitive configuration files outside normal application behavior
• Monitor for PHP errors related to file inclusion failures that may indicate exploitation attempts
• Implement real-time threat detection using SentinelOne to identify behavioral patterns consistent with LFI attacks

How to Mitigate CVE-2026-39611

Immediate Actions Required

• Identify all WordPress installations using the KuteShop theme and verify the installed version
• Update the KuteShop theme to a patched version beyond 4.2.9 if available from kutethemes
• If no patch is available, consider temporarily disabling or replacing the vulnerable theme
• Implement WAF rules to block path traversal attempts targeting WordPress themes
• Review web server logs for any evidence of prior exploitation attempts

Patch Information

Organizations should monitor the kutethemes vendor channels and the Patchstack vulnerability database for patch availability. Update the KuteShop theme to the latest available version once a security patch is released.

Workarounds

• Implement a Web Application Firewall with rules to block path traversal sequences in requests
• Restrict PHP's open_basedir directive to limit file system access to the WordPress installation directory
• Consider using WordPress security plugins that provide virtual patching capabilities
• Temporarily switch to an alternative WordPress theme until a patch is available

# PHP configuration hardening example
# Add to php.ini or .htaccess to restrict file access
open_basedir = /var/www/html/wordpress/
allow_url_include = Off
allow_url_fopen = Off