CVE-2026-22502: Mr. Cobbler Path Traversal Vulnerability

CVE-2026-22502 Overview

CVE-2026-22502 is a PHP Local File Inclusion (LFI) vulnerability affecting the Mr. Cobbler WordPress theme developed by AncoraThemes. 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 vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program).

Critical Impact

Successful exploitation of this vulnerability could allow unauthenticated remote attackers to read sensitive server files, potentially escalating to remote code execution through log poisoning or other advanced techniques.

Affected Products

• Mr. Cobbler WordPress Theme versions through 1.1.9
• WordPress installations running vulnerable Mr. Cobbler theme versions

Discovery Timeline

• 2026-03-25 - CVE-2026-22502 published to NVD
• 2026-03-26 - Last updated in NVD database

Technical Details for CVE-2026-22502

Vulnerability Analysis

This Local File Inclusion vulnerability exists in the Mr. Cobbler WordPress theme due to insufficient validation of user-supplied input used in PHP file inclusion functions. The theme fails to properly sanitize filename parameters before passing them to include(), require(), or similar PHP functions, enabling attackers to traverse directories and include arbitrary files from the local file system.

The attack complexity is elevated because successful exploitation may require specific server configurations or knowledge of the target environment. However, no authentication or user interaction is required to exploit this vulnerability, making it accessible to remote attackers who can craft malicious requests directly.

Root Cause

The root cause is improper input validation and sanitization in the Mr. Cobbler theme's PHP code. User-controlled input is passed directly to file inclusion functions without adequate filtering of directory traversal sequences (such as ../) or validation against an allowlist of permitted files. This violates the principle of least privilege and allows attackers to break out of the intended directory scope.

Attack Vector

The vulnerability is exploitable over the network without authentication. Attackers can manipulate URL parameters or POST data to inject path traversal sequences, allowing them to include sensitive system files such as /etc/passwd, WordPress configuration files (wp-config.php), or other files accessible to the web server process.

In advanced scenarios, attackers may chain this LFI with log file poisoning or uploaded file inclusion to achieve remote code execution. The attacker would first inject malicious PHP code into a log file or uploaded resource, then use the LFI vulnerability to include and execute that code.

Detection Methods for CVE-2026-22502

Indicators of Compromise

• Unusual HTTP requests containing path traversal sequences (../, ..%2f, %2e%2e/) targeting theme files
• Web server logs showing access to sensitive file paths through theme parameters
• Unexpected file read operations from the WordPress theme directory
• Server access logs with requests containing null bytes (%00) or file extension manipulation attempts

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal patterns in HTTP requests
• Monitor WordPress access logs for suspicious parameter values containing directory traversal characters
• Configure intrusion detection systems to alert on file inclusion attack signatures
• Review Apache/Nginx access logs for anomalous requests to the Mr. Cobbler theme's PHP files
• Deploy SentinelOne Singularity to detect and block exploitation attempts in real-time

Monitoring Recommendations

• Enable verbose logging for PHP file operations on WordPress installations
• Set up alerts for unauthorized file read attempts outside the web root directory
• Monitor for execution of sensitive PHP files through unusual code paths
• Implement file integrity monitoring on critical WordPress and system configuration files

How to Mitigate CVE-2026-22502

Immediate Actions Required

• Disable or remove the Mr. Cobbler theme immediately if running version 1.1.9 or earlier
• Switch to a default WordPress theme until a patched version becomes available
• Implement WAF rules to block path traversal attempts targeting theme endpoints
• Audit server logs for signs of previous exploitation attempts
• Consider restricting PHP's open_basedir directive to limit file access scope

Patch Information

As of the last NVD update on 2026-03-26, no vendor patch has been confirmed for this vulnerability. Affected users should monitor the Patchstack WordPress Vulnerability Database for updates on available patches and security advisories from AncoraThemes.

Workarounds

• Remove or deactivate the Mr. Cobbler theme from WordPress installations
• Implement PHP open_basedir restrictions to limit file system access
• Deploy a Web Application Firewall with LFI attack pattern detection
• Use file permissions to restrict web server access to sensitive directories
• Consider implementing PHP input validation at the server level using mod_security or similar tools

# Configuration example - Restrict PHP file access using open_basedir
# Add to php.ini or .htaccess for affected WordPress installation
php_value open_basedir "/var/www/html/:/tmp/"

# Apache mod_rewrite rules to block path traversal attempts
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.\\) [NC]
RewriteRule .* - [F,L]