CVE-2025-53335: Berger Theme Path Traversal Vulnerability

CVE-2025-53335 Overview

CVE-2025-53335 is a Local File Inclusion (LFI) vulnerability affecting the ThemeREX Berger WordPress theme. The vulnerability stems from improper control of filename parameters in PHP include/require statements, allowing attackers to include arbitrary local files on the server. This weakness, classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program), can lead to sensitive information disclosure, configuration file exposure, and potentially remote code execution when combined with other techniques.

Critical Impact

Attackers can exploit this LFI vulnerability to read sensitive server files, access WordPress configuration data including database credentials, and potentially achieve code execution through log poisoning or other file inclusion chaining techniques.

Affected Products

• ThemeREX Berger WordPress Theme versions through 1.1.1

Discovery Timeline

• 2026-03-05 - CVE CVE-2025-53335 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2025-53335

Vulnerability Analysis

This Local File Inclusion vulnerability exists within the ThemeREX Berger WordPress theme due to insufficient validation of user-supplied input in PHP file inclusion operations. The theme fails to properly sanitize or validate filename parameters before passing them to PHP's include() or require() functions, enabling attackers to manipulate these parameters to include arbitrary local files from the server's filesystem.

The vulnerability requires network access to exploit, and successful exploitation allows attackers to traverse directories and include files outside the intended scope. Common targets include the WordPress wp-config.php file containing database credentials, system files like /etc/passwd, and application log files that might contain injected malicious code.

Root Cause

The root cause of this vulnerability is the improper control of filename parameters used in PHP include/require statements. The Berger theme does not adequately validate or sanitize user input before incorporating it into file path operations. This allows directory traversal sequences (such as ../) to escape the intended directory structure and access arbitrary files on the server.

Attack Vector

The attack vector involves crafting malicious HTTP requests that manipulate filename parameters processed by the vulnerable theme components. An attacker can submit specially crafted input containing directory traversal sequences to force the PHP application to include files from arbitrary locations on the filesystem.

The exploitation typically follows this pattern: an attacker identifies the vulnerable parameter, crafts a request with path traversal sequences targeting sensitive files, and the server responds by including and potentially outputting the contents of the targeted file. Advanced exploitation may involve log poisoning, where attackers inject PHP code into log files and then include those logs to achieve code execution.

Detection Methods for CVE-2025-53335

Indicators of Compromise

• Monitor web server access logs for requests containing path traversal patterns such as ../, ..%2f, or encoded variations targeting theme files
• Look for unusual file access patterns in PHP error logs indicating attempts to include non-standard files
• Check for requests attempting to access sensitive files like wp-config.php, /etc/passwd, or log files through theme endpoints

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal attempts in HTTP requests
• Configure intrusion detection systems to alert on requests containing common LFI payloads targeting WordPress theme directories
• Enable detailed logging for the WordPress installation and monitor for anomalous file access patterns

Monitoring Recommendations

• Review web server logs regularly for requests containing directory traversal sequences or null byte injection attempts
• Monitor file integrity on sensitive configuration files to detect unauthorized access or modifications
• Set up alerts for unusual error patterns in PHP logs that may indicate exploitation attempts

How to Mitigate CVE-2025-53335

Immediate Actions Required

• Update the Berger WordPress theme to a patched version when available from ThemeREX
• Temporarily deactivate the Berger theme if a patch is not yet available and switch to a secure alternative theme
• Implement WAF rules to block requests containing path traversal patterns targeting your WordPress installation
• Review server access logs for signs of exploitation attempts and investigate any suspicious activity

Patch Information

Organizations using the ThemeREX Berger theme should check the Patchstack vulnerability database for the latest patch information and updates from the vendor. Until an official patch is released, implementing the workarounds below is strongly recommended.

Workarounds

• Deploy a Web Application Firewall with rules configured to block common LFI attack patterns including encoded traversal sequences
• Restrict PHP open_basedir configuration to limit file access to the WordPress directory and required system directories
• Implement strict input validation on any user-controllable parameters that interact with file operations
• Consider using a virtual patching solution to protect against the vulnerability while awaiting an official fix

# Example: Restrict PHP open_basedir in Apache configuration
# Add to your virtual host or .htaccess file
php_admin_value open_basedir "/var/www/html/wordpress:/tmp"

# Example: Block common LFI patterns in .htaccess
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.\\) [NC,OR]
RewriteCond %{QUERY_STRING} (etc/passwd|proc/self/environ) [NC]
RewriteRule .* - [F,L]