CVE-2026-28019: ThemeREX Manoir File Inclusion Flaw

CVE-2026-28019 Overview

CVE-2026-28019 is a PHP Local File Inclusion (LFI) vulnerability affecting the ThemeREX Manoir WordPress theme. 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 from the server, potentially leading to sensitive information disclosure, configuration file exposure, or even remote code execution if combined with other attack vectors such as log poisoning.

Critical Impact

Attackers can exploit this LFI vulnerability to read sensitive server files, access WordPress configuration data including database credentials, and potentially achieve code execution through log file poisoning or other file inclusion techniques.

Affected Products

• ThemeREX Manoir WordPress Theme version 1.11 and earlier
• All WordPress installations using vulnerable Manoir theme versions
• WordPress sites with default or misconfigured file permissions

Discovery Timeline

• 2026-03-05 - CVE-2026-28019 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-28019

Vulnerability Analysis

This Local File Inclusion vulnerability exists in the Manoir WordPress theme due to insufficient validation and sanitization of user-supplied input that is subsequently used in PHP include or require statements. The vulnerability falls under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program), which specifically addresses scenarios where PHP applications fail to properly validate file paths before including them.

When exploited, an attacker can manipulate input parameters to traverse directories and include arbitrary files from the local file system. This can expose sensitive configuration files such as wp-config.php, server configuration files, or log files that may contain credentials or session data.

Root Cause

The root cause of this vulnerability is the improper handling of user-controlled input in PHP include/require functions within the Manoir theme. The theme fails to implement adequate input validation, path canonicalization, or allowlist-based filtering before using externally supplied values in file inclusion operations. This allows path traversal sequences (e.g., ../) to escape the intended directory and access files elsewhere on the server.

Attack Vector

The attack vector involves manipulating HTTP request parameters that are processed by the vulnerable theme component. An attacker crafts malicious requests containing directory traversal sequences to navigate outside the intended directory structure. Common exploitation patterns include accessing the WordPress configuration file to extract database credentials, reading /etc/passwd to enumerate system users, or including log files that have been poisoned with PHP code to achieve remote code execution.

The vulnerability can be exploited remotely without authentication, making it particularly dangerous for publicly accessible WordPress installations. Successful exploitation depends on the web server's file permissions and PHP configuration, but even limited access can expose critical application data.

Detection Methods for CVE-2026-28019

Indicators of Compromise

• HTTP requests containing directory traversal sequences such as ../, ..%2f, or ..%5c targeting theme files
• Access log entries showing attempts to include sensitive files like wp-config.php, /etc/passwd, or log files
• Unexpected file access patterns in web server logs indicating path traversal attempts
• Error logs containing PHP warnings about failed file inclusions or path-related errors

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block path traversal patterns in requests
• Monitor web server access logs for suspicious requests targeting the Manoir theme directory with unusual path patterns
• Deploy file integrity monitoring on sensitive configuration files to detect unauthorized access
• Use intrusion detection systems with signatures for common LFI exploitation techniques

Monitoring Recommendations

• Enable detailed PHP error logging and monitor for include/require warnings or failures
• Implement real-time alerting for HTTP requests containing encoded path traversal sequences
• Configure SIEM rules to correlate multiple failed file inclusion attempts from single sources
• Monitor for unusual file access patterns in WordPress theme directories

How to Mitigate CVE-2026-28019

Immediate Actions Required

• Update the ThemeREX Manoir theme to the latest patched version immediately
• If no patch is available, consider temporarily deactivating the Manoir theme and switching to a secure alternative
• Implement WAF rules to block requests containing path traversal patterns targeting the theme
• Review server access logs for evidence of exploitation attempts

Patch Information

Users should check for theme updates through the WordPress admin dashboard or contact ThemeREX directly for a security patch. Additional technical details and patch status can be found in the Patchstack Vulnerability Report.

Workarounds

• Implement strict input validation at the web server level using ModSecurity or similar WAF solutions
• Configure PHP open_basedir directive to restrict file access to the WordPress directory
• Apply file system permissions to limit the web server user's read access to sensitive files
• Consider using a virtual patching solution while awaiting an official security update

If applying web server-level mitigations, configure your WAF or .htaccess to block suspicious patterns. The specific configuration will depend on your server environment and should include rules to reject requests containing directory traversal sequences targeting theme assets.