CVE-2025-58879: Ancorathemes Festy Path Traversal Flaw

CVE-2025-58879 Overview

CVE-2025-58879 is a Local File Inclusion (LFI) vulnerability affecting the AncoraThemes Festy WordPress theme. The vulnerability stems from improper control of filename for include/require statements in PHP, allowing unauthenticated attackers to include arbitrary local files on the server. This can lead to sensitive information disclosure and potentially escalate to remote code execution under certain server configurations.

Critical Impact

Unauthenticated attackers can exploit this LFI vulnerability to read sensitive configuration files, access database credentials, or potentially achieve code execution by including malicious files previously uploaded to the server.

Affected Products

• AncoraThemes Festy WordPress Theme versions up to and including 1.13.0

Discovery Timeline

• 2025-12-18 - CVE-2025-58879 published to NVD
• 2026-01-20 - Last updated in NVD database

Technical Details for CVE-2025-58879

Vulnerability Analysis

This vulnerability falls under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). The Festy WordPress theme fails to properly sanitize or validate user-supplied input before passing it to PHP's file inclusion functions (include, require, include_once, or require_once). This allows an attacker to manipulate the file path parameter to include arbitrary files from the local file system.

The vulnerability is accessible over the network without requiring any authentication or user interaction. Successful exploitation can result in disclosure of sensitive server-side files, including WordPress configuration files (wp-config.php), system files (/etc/passwd), and other sensitive data. While the primary impact is confidentiality-focused, attackers may chain this vulnerability with other techniques to achieve code execution.

Root Cause

The root cause lies in insufficient input validation within the Festy theme's PHP code. When processing user-supplied parameters that determine which file to include, the theme does not adequately filter directory traversal sequences (such as ../) or validate that the requested file is within an expected directory. This allows attackers to traverse the file system and include files outside the intended scope.

Attack Vector

The attack is network-based and requires no authentication. An attacker can craft malicious HTTP requests containing path traversal sequences to manipulate the file inclusion logic. By supplying input such as ../../../../etc/passwd or ../../../../wp-config.php, the attacker can force the application to include and potentially disclose the contents of sensitive files.

The vulnerability mechanism involves manipulating parameters passed to PHP include functions. Attackers typically use directory traversal sequences to escape the intended directory and access system or configuration files. In WordPress environments, attackers commonly target wp-config.php to obtain database credentials. For technical details, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-58879

Indicators of Compromise

• HTTP requests containing path traversal sequences (../, ..%2f, ..%5c) targeting Festy theme endpoints
• Access log entries showing attempts to include sensitive files like wp-config.php, /etc/passwd, or other system files
• Unusual file access patterns in PHP error logs indicating failed include attempts
• Web application firewall alerts for LFI attack patterns

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block path traversal sequences in HTTP parameters
• Monitor access logs for requests containing encoded directory traversal patterns such as %2e%2e%2f or %252e%252e%252f
• Deploy file integrity monitoring on critical configuration files to detect unauthorized access attempts
• Use endpoint detection solutions to identify unusual PHP process behavior or file access patterns

Monitoring Recommendations

• Enable verbose logging on WordPress installations to capture detailed request information
• Configure alerts for any access attempts to sensitive configuration files from web processes
• Monitor for unusual patterns in PHP error logs that may indicate exploitation attempts
• Implement real-time log analysis to detect and alert on LFI attack signatures

How to Mitigate CVE-2025-58879

Immediate Actions Required

• Remove or deactivate the Festy WordPress theme immediately if running version 1.13.0 or earlier
• Review web server access logs for any evidence of exploitation attempts
• Audit WordPress configuration and database credentials for potential exposure
• Consider rotating database passwords and WordPress secret keys as a precaution

Patch Information

At the time of publication, organizations should check with AncoraThemes for an updated version of the Festy theme that addresses this vulnerability. Monitor the Patchstack WordPress Vulnerability Report for updates on patch availability.

Workarounds

• Implement WAF rules to block requests containing path traversal sequences targeting theme files
• Restrict access to the WordPress theme directory using web server configuration
• Apply PHP open_basedir restrictions to limit file access scope for the WordPress installation
• Consider switching to an alternative WordPress theme until an official patch is released

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