CVE-2026-22363: Rhodos Path Traversal Vulnerability

CVE-2026-22363 Overview

CVE-2026-22363 is a PHP Local File Inclusion (LFI) vulnerability affecting the Rhodos WordPress theme developed by axiomthemes. The vulnerability stems from improper control of filename parameters used in PHP include/require statements, allowing attackers to include arbitrary local files from the server. This type of vulnerability can lead to sensitive information disclosure, configuration file exposure, and potentially remote code execution if combined with other attack techniques.

Critical Impact

This vulnerability allows unauthenticated attackers to read sensitive files from the server, potentially exposing database credentials, WordPress configuration data, and other critical system files through PHP Local File Inclusion.

Affected Products

• Rhodos WordPress Theme versions through 1.3.3
• WordPress installations using the vulnerable Rhodos theme
• All axiomthemes Rhodos theme deployments with affected versions

Discovery Timeline

• 2026-02-20 - CVE-2026-22363 published to NVD
• 2026-02-24 - Last updated in NVD database

Technical Details for CVE-2026-22363

Vulnerability Analysis

This vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). The Rhodos WordPress theme fails to properly sanitize user-controlled input before passing it to PHP's file inclusion functions. While the CVE title references Remote File Inclusion (RFI), the actual exploitable condition is Local File Inclusion (LFI), which allows attackers to traverse the directory structure and include files that exist on the target server.

The vulnerability can be exploited over the network without requiring authentication or user interaction, though exploitation complexity is considered high due to specific conditions that must be met. Successful exploitation can result in complete compromise of confidentiality, integrity, and availability of the affected system.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and sanitization of user-supplied parameters that control file paths within PHP include or require statements. The Rhodos theme does not adequately filter or restrict the filename parameter, allowing attackers to inject path traversal sequences (such as ../) to access files outside the intended directory scope.

Common patterns that lead to this type of vulnerability include:

• Direct use of $_GET, $_POST, or $_REQUEST variables in include statements
• Inadequate path normalization and canonicalization
• Missing allowlist validation for acceptable file inclusions
• Failure to restrict file extensions or enforce directory boundaries

Attack Vector

The attack vector for CVE-2026-22363 is network-based, meaning exploitation can occur remotely without physical access to the target system. An attacker can craft malicious HTTP requests containing path traversal sequences to manipulate the file inclusion logic.

Typical exploitation of this vulnerability involves sending requests with manipulated parameters that traverse directories to access sensitive files such as wp-config.php, /etc/passwd, or log files containing sensitive information. In some scenarios, attackers may chain this LFI vulnerability with other techniques such as log poisoning or PHP wrapper manipulation to achieve remote code execution.

The vulnerability affects WordPress installations running the Rhodos theme version 1.3.3 and earlier. Detailed technical information about the exploitation mechanism can be found in the Patchstack security advisory.

Detection Methods for CVE-2026-22363

Indicators of Compromise

• Unusual HTTP requests containing path traversal patterns such as ../, ..%2f, or ..%252f targeting theme-related endpoints
• Web server access logs showing repeated requests with file path manipulation attempts
• Unexpected file access or read operations on sensitive configuration files like wp-config.php
• Error logs indicating failed file inclusion attempts or permission denied errors for files outside web root

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block path traversal sequences in request parameters
• Implement file integrity monitoring on sensitive WordPress configuration files and theme directories
• Configure intrusion detection systems (IDS) to alert on LFI attack patterns targeting WordPress installations
• Monitor PHP error logs for include/require warnings that reference unexpected file paths

Monitoring Recommendations

• Enable verbose logging for WordPress and web server access logs to capture full request URIs
• Implement real-time log analysis to detect patterns indicative of LFI exploitation attempts
• Set up alerts for any access attempts to sensitive system files from web application contexts
• Regularly audit installed WordPress themes and plugins for known vulnerabilities using security scanners

How to Mitigate CVE-2026-22363

Immediate Actions Required

• Update the Rhodos WordPress theme to a patched version if available from axiomthemes
• If no patch is available, consider temporarily disabling or replacing the Rhodos theme with a secure alternative
• Implement WAF rules to block path traversal attempts targeting the vulnerable theme endpoints
• Review server access logs for signs of prior exploitation attempts

Patch Information

At the time of publication, users should consult the Patchstack vulnerability database for the latest patch status and remediation guidance from axiomthemes. Organizations should monitor for security updates from the theme vendor and apply patches immediately upon release.

Workarounds

• Implement strict input validation using allowlists for any file inclusion parameters at the application level
• Deploy ModSecurity or similar WAF with OWASP Core Rule Set to detect and block LFI attempts
• Restrict PHP file inclusion paths using open_basedir directive in PHP configuration
• Apply principle of least privilege to web server file system permissions to limit the impact of successful exploitation

# PHP configuration hardening (php.ini)
# Restrict file access to web directory and required paths
open_basedir = /var/www/html:/tmp

# Disable dangerous PHP functions if not required
disable_functions = exec,passthru,shell_exec,system,proc_open,popen

# Apache ModSecurity rule to block path traversal
# Add to .htaccess or Apache configuration
SecRule REQUEST_URI|ARGS|ARGS_NAMES "@rx (?:\.\.[\\/])" \
    "id:100001,phase:2,deny,status:403,msg:'Path Traversal Attempt Blocked'"