CVE-2026-27341: TopScorer WordPress Theme LFI Vulnerability

CVE-2026-27341 Overview

CVE-2026-27341 is a Local File Inclusion (LFI) vulnerability affecting the TopScorer - Sports WordPress Theme developed by Mikado-Themes. The vulnerability stems from improper control of filename for include/require statements in PHP, classified under CWE-98. This flaw allows attackers to include arbitrary local files on the server, potentially leading to sensitive information disclosure, code execution, or complete site compromise.

Critical Impact

Successful exploitation of this Local File Inclusion vulnerability could allow attackers to read sensitive configuration files (such as wp-config.php), access server credentials, or chain with other vulnerabilities to achieve remote code execution on affected WordPress installations.

Affected Products

• TopScorer - Sports WordPress Theme version 1.2 and earlier
• WordPress installations running vulnerable TopScorer theme versions
• All sites using Mikado-Themes TopScorer theme through version 1.2

Discovery Timeline

• 2026-03-05 - CVE CVE-2026-27341 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-27341

Vulnerability Analysis

This vulnerability is categorized as an Improper Control of Filename for Include/Require Statement in PHP Program (CWE-98). The TopScorer 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 allows an attacker to manipulate file paths and include arbitrary local files from the server's filesystem.

Local File Inclusion vulnerabilities in WordPress themes are particularly dangerous because they can expose sensitive WordPress configuration files containing database credentials, authentication keys, and other critical information. Additionally, LFI can be escalated to Remote Code Execution when combined with log poisoning techniques, file upload functionality, or PHP wrapper abuse.

Root Cause

The root cause of this vulnerability lies in insufficient input validation within the TopScorer theme's PHP code. When user-controlled parameters are passed directly to file inclusion functions without proper sanitization, attackers can traverse directories using sequences like ../ or leverage PHP stream wrappers to access files outside the intended directory scope. The theme lacks proper allowlist validation for filenames and fails to implement secure coding practices for dynamic file inclusion.

Attack Vector

The attack vector for this Local File Inclusion vulnerability involves manipulating user-controllable input parameters that are processed by the theme's file inclusion logic. An attacker can craft malicious requests containing directory traversal sequences to access sensitive files on the server.

Typical exploitation involves:

1. Identifying vulnerable parameters in the TopScorer theme that accept file paths
2. Injecting path traversal sequences such as ../../../ to navigate to target files
3. Accessing sensitive files like /etc/passwd, wp-config.php, or log files
4. Potentially escalating to code execution through log poisoning or PHP filter chains

For detailed technical analysis and proof-of-concept information, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-27341

Indicators of Compromise

• Unusual web server log entries containing directory traversal patterns (../, ..%2f, %2e%2e/)
• HTTP requests attempting to access system files like /etc/passwd or wp-config.php through theme parameters
• Unexpected file access patterns in web server access logs targeting the TopScorer theme directory
• Error logs showing failed file inclusion attempts or PHP warnings related to missing files

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block path traversal patterns in HTTP requests
• Implement intrusion detection signatures monitoring for LFI attack patterns targeting WordPress themes
• Configure file integrity monitoring to alert on unexpected file access within WordPress directories
• Enable detailed PHP error logging to capture inclusion failures that may indicate exploitation attempts

Monitoring Recommendations

• Monitor web server access logs for requests containing encoded path traversal sequences (%2e%2e%2f, ..%252f)
• Set up alerting for unusual access patterns to sensitive WordPress files like wp-config.php
• Implement real-time monitoring for PHP file inclusion errors in the TopScorer theme directory
• Review authentication logs for signs of credential theft following potential configuration file exposure

How to Mitigate CVE-2026-27341

Immediate Actions Required

• Immediately audit your WordPress installation to determine if the TopScorer theme version 1.2 or earlier is installed
• Disable or remove the TopScorer theme until a patched version is available from Mikado-Themes
• Apply WAF rules to block path traversal attack patterns targeting your WordPress installation
• Review server logs for signs of exploitation attempts or successful file inclusion attacks
• Consider switching to an alternative sports-themed WordPress theme that does not contain this vulnerability

Patch Information

As of the CVE publication date, affected users should check with Mikado-Themes for security updates or patched versions of the TopScorer theme. Monitor the Patchstack Vulnerability Report for updates on available patches and remediation guidance.

Workarounds

• Deactivate the TopScorer theme and switch to a secure alternative theme temporarily
• Implement server-level access controls to restrict PHP file inclusion to trusted directories only
• Configure open_basedir in PHP to limit file access scope for WordPress installations
• Deploy a Web Application Firewall with rules specifically blocking LFI attack vectors

# PHP configuration hardening example for open_basedir restriction
# Add to php.ini or virtual host configuration
open_basedir = /var/www/html/wordpress:/tmp

# Apache .htaccess rule to block common LFI patterns
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.) [NC,OR]
RewriteCond %{QUERY_STRING} (\.\.%2f|%2e%2e) [NC]
RewriteRule .* - [F,L]