CVE-2026-28079: Conquerors Theme LFI Vulnerability

CVE-2026-28079 Overview

CVE-2026-28079 is a Local File Inclusion (LFI) vulnerability in the axiomthemes Conquerors WordPress theme. The vulnerability stems from improper control of filename for include/require statements in PHP, allowing attackers to include arbitrary local files on the server. This type of vulnerability can enable unauthorized access to sensitive server files, potentially leading to information disclosure, code execution, or complete system compromise.

Critical Impact

This vulnerability allows unauthenticated attackers to include local files on vulnerable WordPress installations, potentially exposing sensitive configuration files, credentials, or enabling further exploitation through log poisoning or other techniques.

Affected Products

• axiomthemes Conquerors WordPress Theme versions through 1.2.13
• WordPress installations using the vulnerable Conquerors theme

Discovery Timeline

• 2026-03-05 - CVE-2026-28079 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-28079

Vulnerability Analysis

This vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). The Conquerors theme fails to properly validate or sanitize user-supplied input before using it in PHP include or require statements. This allows an attacker to manipulate the file path parameter to include arbitrary files from the local file system.

Local File Inclusion vulnerabilities in WordPress themes are particularly dangerous because they can be exploited to read sensitive files such as wp-config.php, which contains database credentials and authentication keys. In more advanced scenarios, attackers can chain LFI with log poisoning or other techniques to achieve remote code execution.

The network-accessible attack vector combined with no required user interaction makes this vulnerability exploitable by remote unauthenticated attackers, though the high attack complexity indicates that specific conditions may need to be met for successful exploitation.

Root Cause

The root cause of this vulnerability is insufficient input validation in the Conquerors theme's PHP code. The theme accepts user-controllable input that specifies a filename or path for PHP's include() or require() functions without proper sanitization. This allows attackers to use path traversal sequences (such as ../) to navigate outside the intended directory and include arbitrary files from the server's file system.

Attack Vector

The vulnerability is exploitable over the network without requiring authentication or user interaction. An attacker can craft malicious HTTP requests containing path traversal sequences to include local files on the server. Typical exploitation targets include:

• WordPress configuration files (wp-config.php) containing database credentials
• Server configuration files (/etc/passwd, /etc/shadow)
• Apache/Nginx access and error logs for log poisoning attacks
• PHP session files for session manipulation

The exploitation mechanism involves manipulating parameters that are passed to PHP include functions, using sequences like ../../ to traverse directories and access files outside the web root.

Detection Methods for CVE-2026-28079

Indicators of Compromise

• Unusual HTTP requests containing path traversal sequences (../, ..%2f, %2e%2e/) targeting theme files
• Web server logs showing requests attempting to access /etc/passwd, wp-config.php, or other sensitive files
• Requests with encoded path traversal characters (URL encoding, double encoding)
• Unexpected file access patterns in PHP error logs referencing the Conquerors theme

Detection Strategies

• Monitor web server access logs for requests containing directory traversal patterns targeting the Conquerors theme directory
• Implement Web Application Firewall (WAF) rules to detect and block LFI attack patterns
• Enable PHP error logging and monitor for unexpected file inclusion warnings
• Use intrusion detection systems (IDS) with signatures for LFI attack patterns

Monitoring Recommendations

• Configure SIEM alerts for HTTP requests containing typical LFI payloads targeting WordPress theme directories
• Monitor file access events for sensitive configuration files being read by the web server process
• Implement application-level logging to track include/require function calls with user-supplied parameters
• Regularly audit web server logs for reconnaissance activity targeting WordPress installations

How to Mitigate CVE-2026-28079

Immediate Actions Required

• Identify all WordPress installations using the Conquerors theme version 1.2.13 or earlier
• Consider temporarily disabling or replacing the vulnerable theme until a patch is available
• Implement WAF rules to block path traversal attempts targeting the Conquerors theme
• Review web server logs for evidence of exploitation attempts

Patch Information

Check the Patchstack WordPress Vulnerability Analysis for the latest patch information and updates from the theme developer. Monitor axiomthemes for security updates addressing this vulnerability.

Workarounds

• Implement strict input validation and whitelisting for any user-controllable file paths at the application or WAF level
• Use open_basedir PHP directive to restrict file access to the WordPress installation directory
• Configure proper file permissions to limit the web server's ability to read sensitive system files
• Deploy a Web Application Firewall with LFI protection rules enabled
• Consider using virtual patching through security plugins like Patchstack or Wordfence

# PHP configuration hardening example for php.ini
# Restrict file access to WordPress directory only
open_basedir = /var/www/wordpress/:/tmp/

# Disable dangerous PHP functions
disable_functions = exec,passthru,shell_exec,system,proc_open,popen

# Enable strict mode for includes
allow_url_include = Off
allow_url_fopen = Off