CVE-2026-22376: Parkivia Path Traversal Vulnerability

CVE-2026-22376 Overview

CVE-2026-22376 is a PHP Local File Inclusion (LFI) vulnerability affecting the Parkivia WordPress theme developed by AncoraThemes. The vulnerability arises from improper control of filename parameters used in PHP include or require statements. This flaw allows unauthenticated attackers to include local files from the server, potentially exposing sensitive configuration files, credentials, and in certain scenarios, enabling code execution through log poisoning or other LFI-to-RCE techniques.

Critical Impact

Unauthenticated attackers can exploit this LFI vulnerability to read sensitive files from WordPress installations, potentially exposing database credentials, API keys, and other configuration data that could lead to full site compromise.

Affected Products

• AncoraThemes Parkivia WordPress Theme versions up to and including 1.1.9
• WordPress installations using vulnerable Parkivia theme versions

Discovery Timeline

• 2026-02-20 - CVE-2026-22376 published to NVD
• 2026-02-20 - Last updated in NVD database

Technical Details for CVE-2026-22376

Vulnerability Analysis

This vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). The Parkivia theme fails to properly validate and sanitize user-controlled input before passing it to PHP's include() or require() functions. This allows an attacker to manipulate file path parameters to traverse directories and include arbitrary local files from the web server.

Local File Inclusion vulnerabilities in WordPress themes are particularly dangerous because they can expose the wp-config.php file, which contains database credentials, authentication keys, and other sensitive configuration data. Furthermore, when combined with techniques such as log poisoning or PHP wrapper abuse, LFI can escalate to Remote Code Execution.

The vulnerability is network-accessible, meaning attackers can exploit it remotely without requiring any authentication. While the attack complexity is higher due to the need for specific conditions or chaining techniques for maximum impact, successful exploitation can result in complete compromise of confidentiality, integrity, and availability.

Root Cause

The root cause of CVE-2026-22376 is the failure to implement proper input validation and sanitization on user-supplied file path parameters within the Parkivia theme. The vulnerable code accepts file path input without adequately checking for path traversal sequences such as ../ or validating that the requested file exists within an expected directory. PHP's include/require functions then process these unsanitized paths, allowing attackers to reference files outside the intended directory structure.

Attack Vector

The attack vector for this vulnerability is network-based, where an attacker sends specially crafted HTTP requests to the WordPress site running the vulnerable Parkivia theme. The malicious request contains path traversal sequences designed to navigate outside the web root directory and include sensitive system or application files.

A typical exploitation scenario involves constructing requests that traverse from the theme directory to the WordPress root to access wp-config.php, or further up to access system files like /etc/passwd. The attacker does not need any authentication or special privileges to exploit this vulnerability, making it accessible to any remote attacker who can reach the WordPress installation.

For detailed technical information about the exploitation mechanism and proof-of-concept details, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-22376

Indicators of Compromise

• HTTP requests to Parkivia theme files containing path traversal sequences (../, ..%2f, %2e%2e/)
• Access logs showing requests for sensitive files like wp-config.php, /etc/passwd, or similar system files via theme endpoints
• Unusual file access patterns originating from the Parkivia theme directory
• Web server error logs indicating file inclusion attempts for non-existent or protected paths

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal sequences in request parameters targeting the Parkivia theme
• Monitor web server access logs for suspicious requests containing directory traversal patterns
• Deploy file integrity monitoring on critical WordPress configuration files to detect unauthorized access attempts
• Use WordPress security plugins that can detect and alert on LFI exploitation attempts

Monitoring Recommendations

• Enable detailed logging for all requests to WordPress theme directories
• Set up alerts for requests containing encoded path traversal characters (%2e, %2f, %00)
• Monitor for unusual outbound data transfers that may indicate successful exfiltration of configuration files
• Review server access logs regularly for patterns indicating reconnaissance or exploitation attempts

How to Mitigate CVE-2026-22376

Immediate Actions Required

• Update the Parkivia theme to a patched version if one is available from AncoraThemes
• If no patch is available, consider temporarily deactivating the Parkivia theme and switching to a secure alternative
• Implement WAF rules to block path traversal attempts targeting the vulnerable theme
• Rotate WordPress database credentials and authentication keys as a precaution if exploitation is suspected

Patch Information

Organizations using the AncoraThemes Parkivia theme should check for updates through the WordPress theme update mechanism or directly from AncoraThemes. All versions through 1.1.9 are confirmed vulnerable. Review the Patchstack Vulnerability Report for the latest remediation guidance.

Workarounds

• Deploy a Web Application Firewall with rules to block requests containing path traversal sequences
• Restrict PHP's open_basedir directive to limit file access to the WordPress installation directory
• Implement server-level access controls to prevent the web server user from reading sensitive system files
• If the vulnerable functionality is not required, consider removing or disabling the affected theme component

# Example: Configure open_basedir restriction in PHP
# Add to php.ini or .htaccess (Apache)
open_basedir = /var/www/html/wordpress:/tmp

# Example: Apache mod_rewrite rule to block path traversal
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.%2f|%2e%2e) [NC]
RewriteRule ^wp-content/themes/parkivia/.* - [F,L]