CVE-2026-27985: ThemeREX Humanum LFI Vulnerability

CVE-2026-27985 Overview

CVE-2026-27985 is a Local File Inclusion (LFI) vulnerability affecting the ThemeREX Humanum WordPress theme. 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 arbitrary local files from the server, potentially leading to sensitive information disclosure, configuration file exposure, or in certain scenarios, remote code execution through log poisoning or other advanced techniques.

Critical Impact

Attackers can exploit this LFI vulnerability to read sensitive files from the WordPress installation, including wp-config.php which contains database credentials, authentication keys, and other critical configuration data.

Affected Products

• ThemeREX Humanum WordPress Theme version 1.1.4 and earlier
• WordPress installations running the vulnerable Humanum theme
• All PHP environments hosting the affected theme versions

Discovery Timeline

• 2026-03-05 - CVE-2026-27985 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-27985

Vulnerability Analysis

The vulnerability exists due to insufficient input validation and sanitization when the Humanum theme processes user-controlled input that is subsequently used in PHP include(), require(), include_once(), or require_once() statements. WordPress themes often dynamically load template files, components, or modules based on user requests or theme settings. When this mechanism fails to properly validate and restrict the file paths that can be included, attackers can manipulate the input to traverse directories and include arbitrary files from the server's file system.

Local File Inclusion vulnerabilities in WordPress themes are particularly dangerous because they can expose the wp-config.php file, which contains database credentials, table prefixes, and authentication salts. Additionally, if the server stores sensitive log files or allows file uploads, attackers may chain this vulnerability with other techniques to achieve remote code execution.

Root Cause

The root cause of this vulnerability is the improper handling of user-supplied input in file inclusion operations within the Humanum theme's PHP code. The theme fails to implement adequate path validation, allowing directory traversal sequences (such as ../) or absolute paths to be processed by PHP include functions. This lack of input sanitization violates secure coding practices for dynamic file inclusion in PHP applications.

Attack Vector

The attack vector for this LFI vulnerability involves manipulating request parameters or theme settings that control file inclusion behavior. An attacker can craft malicious requests containing path traversal sequences to escape the intended directory and access sensitive files elsewhere on the server.

The exploitation typically follows this pattern: an attacker identifies a parameter that controls file inclusion, then injects path traversal sequences to navigate to sensitive files like /etc/passwd on Linux systems or WordPress configuration files. The included file content may be rendered in the response or processed by the PHP interpreter, depending on the inclusion context.

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

Detection Methods for CVE-2026-27985

Indicators of Compromise

• HTTP requests containing path traversal sequences (../, ..%2f, ..%5c) targeting the Humanum theme
• Access log entries showing attempts to include sensitive files like wp-config.php, /etc/passwd, or log files
• Unusual file read operations in web server logs originating from theme-related endpoints
• Error messages or stack traces revealing file path information in responses

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal patterns in requests
• Monitor WordPress theme-related request parameters for suspicious file path inputs
• Deploy file integrity monitoring on WordPress installations to detect unauthorized configuration access
• Configure intrusion detection systems to alert on LFI attack patterns targeting WordPress themes

Monitoring Recommendations

• Enable detailed access logging on WordPress installations and review for path traversal attempts
• Set up alerts for requests containing encoded traversal sequences (%2e%2e%2f, %252e%252e%252f)
• Monitor PHP error logs for failed include/require operations that may indicate exploitation attempts
• Implement real-time log analysis for patterns associated with LFI reconnaissance and exploitation

How to Mitigate CVE-2026-27985

Immediate Actions Required

• Remove or deactivate the ThemeREX Humanum theme if running version 1.1.4 or earlier
• Check with ThemeREX for an updated version that addresses this vulnerability
• Review WordPress access logs for signs of exploitation attempts
• Audit WordPress installations for any unauthorized access or data exfiltration

Patch Information

As of the vulnerability disclosure, users should consult the Patchstack vulnerability report for the latest patch status and remediation guidance from ThemeREX. Contact the theme vendor directly for information about patched versions.

Workarounds

• Disable or remove the Humanum theme until a patched version is available
• Implement WAF rules to block path traversal patterns in requests to the WordPress installation
• Restrict file system permissions to prevent web server access to sensitive directories
• Consider switching to an alternative WordPress theme that does not contain this vulnerability

# Temporary WAF rule example for Apache mod_security
# Add to WordPress .htaccess or mod_security configuration
SecRule REQUEST_URI|ARGS|REQUEST_BODY "@contains ../" "id:1001,phase:2,deny,status:403,msg:'Path Traversal Attempt Blocked'"
SecRule REQUEST_URI|ARGS|REQUEST_BODY "@contains %2e%2e%2f" "id:1002,phase:2,deny,status:403,msg:'Encoded Path Traversal Blocked'"