CVE-2026-27336: Consultor WordPress Theme LFI Vulnerability

CVE-2026-27336 Overview

CVE-2026-27336 is a Local File Inclusion (LFI) vulnerability affecting the Consultor WordPress Theme by AncoraThemes. The vulnerability stems from improper control of filename parameters used in PHP include/require statements, which allows attackers to include arbitrary local files from the server. This type of vulnerability can lead to sensitive information disclosure, configuration file exposure, and in certain configurations, remote code execution through log poisoning or other advanced techniques.

Critical Impact

Attackers can exploit this LFI vulnerability to read sensitive server files, potentially exposing database credentials, WordPress configuration data, and other confidential information stored on the web server.

Affected Products

• AncoraThemes Consultor | Consulting, Accounting & Legal Counsel WordPress Theme versions through 1.2.4

Discovery Timeline

• 2026-03-05 - CVE-2026-27336 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-27336

Vulnerability Analysis

This vulnerability falls under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). The Consultor WordPress theme fails to properly sanitize user-supplied input before using it in PHP include or require statements. When user-controlled data is passed directly to these functions without adequate validation, attackers can manipulate the file path to include unintended files from the local filesystem.

Local File Inclusion vulnerabilities in WordPress themes are particularly concerning because they can expose critical configuration files such as wp-config.php, which contains database credentials, authentication keys, and other sensitive configuration parameters.

Root Cause

The root cause of this vulnerability is insufficient input validation and sanitization of file path parameters before they are processed by PHP's file inclusion functions. The theme likely accepts user input (through URL parameters, POST data, or other input vectors) that influences which files get included, without properly restricting the allowed file paths to a predefined set of safe files.

Attack Vector

An attacker can exploit this vulnerability by manipulating file path parameters to traverse directories and include arbitrary local files. The attack typically involves:

1. Identifying the vulnerable parameter that accepts file path input
2. Using directory traversal sequences (such as ../) to navigate outside the intended directory
3. Including sensitive files like /etc/passwd on Linux systems or WordPress configuration files
4. Potentially chaining with other techniques like log poisoning to achieve code execution

The vulnerability manifests through improper handling of PHP include/require statements. Attackers can manipulate input parameters to traverse directories and access sensitive local files. For detailed technical analysis, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-27336

Indicators of Compromise

• Unusual HTTP requests containing directory traversal patterns (../, ..%2f, %2e%2e/) in URL parameters
• Access attempts to sensitive files such as wp-config.php, /etc/passwd, or log files
• Web server logs showing repeated requests with file path manipulation attempts
• Anomalous file read operations by the web server process

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block directory traversal patterns in HTTP requests
• Monitor web server access logs for patterns containing ../ sequences or encoded variants
• Deploy file integrity monitoring to detect unauthorized access to sensitive configuration files
• Use SentinelOne's behavioral AI to detect anomalous file access patterns by web server processes

Monitoring Recommendations

• Enable detailed logging for all HTTP requests to WordPress installations
• Configure alerts for access attempts to sensitive file paths outside web root
• Monitor for unusual PHP process behavior including unexpected file read operations
• Implement real-time log analysis to detect LFI exploitation attempts

How to Mitigate CVE-2026-27336

Immediate Actions Required

• Audit your WordPress installations for the presence of the Consultor theme version 1.2.4 or earlier
• Consider temporarily disabling or replacing the vulnerable theme until a patch is available
• Implement WAF rules to block directory traversal attempts targeting WordPress themes
• Review server access logs for any signs of exploitation attempts

Patch Information

At the time of publication, users should check with AncoraThemes for the latest version of the Consultor theme that addresses this vulnerability. Monitor the Patchstack Vulnerability Report for updates on patch availability.

Workarounds

• Deploy a Web Application Firewall (WAF) with rules specifically targeting LFI and directory traversal attacks
• Restrict PHP's open_basedir directive to limit file access to the WordPress installation directory
• Implement strict file permissions to prevent the web server from reading sensitive system files
• Consider using a virtual patching solution until an official fix is released

# Example: Restrict PHP open_basedir in php.ini or .htaccess
# Add to php.ini
open_basedir = /var/www/html:/tmp

# Or add to .htaccess for Apache
php_value open_basedir /var/www/html:/tmp