CVE-2025-49254: Nika Theme File Inclusion Vulnerability

CVE-2025-49254 Overview

CVE-2025-49254 is a Local File Inclusion (LFI) vulnerability affecting the Nika WordPress theme developed by thembay. The vulnerability stems from improper control of filename parameters used in PHP include/require statements, allowing attackers to include arbitrary local files on the server. This type of vulnerability can lead to sensitive information disclosure, configuration file exposure, and in certain scenarios, remote code execution through log poisoning or other advanced techniques.

Critical Impact

Unauthenticated attackers can exploit this LFI vulnerability to read sensitive server files, potentially exposing database credentials, configuration files, and other confidential data that could lead to complete site compromise.

Affected Products

• Nika WordPress Theme versions through 1.2.8
• WordPress installations using the vulnerable Nika theme
• Websites with default or misconfigured file permissions

Discovery Timeline

• 2025-06-17 - CVE-2025-49254 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-49254

Vulnerability Analysis

This vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). The Nika theme fails to properly sanitize user-supplied input before using it in PHP's include() or require() functions. When user input is passed directly to these file inclusion functions without adequate validation, attackers can manipulate the file path to traverse directories and access files outside the intended scope.

The network-accessible nature of this vulnerability means that attackers can exploit it remotely without requiring authentication. The exploitation requires some complexity as attackers need to identify the vulnerable parameter and craft appropriate payloads, but successful exploitation can result in significant impact to confidentiality, integrity, and availability of the affected system.

Root Cause

The root cause of CVE-2025-49254 lies in insufficient input validation and sanitization of file path parameters within the Nika theme's PHP code. The theme accepts user-controlled input for file inclusion operations without properly filtering directory traversal sequences (such as ../) or validating that the requested file resides within an allowed directory. This allows attackers to break out of the intended directory structure and access arbitrary files on the filesystem that are readable by the web server process.

Attack Vector

The attack vector for this vulnerability is network-based, meaning exploitation can occur remotely over HTTP/HTTPS requests to the WordPress site. An attacker would typically identify a vulnerable endpoint in the Nika theme that accepts a filename or path parameter, then craft a malicious request containing directory traversal sequences to include sensitive files such as /etc/passwd, wp-config.php, or server configuration files. The vulnerability does not require user interaction or special privileges, though the complexity of exploitation may vary based on the specific implementation and server configuration.

The vulnerability mechanism involves manipulating file path parameters passed to PHP include functions. Attackers typically use directory traversal sequences to access files outside the intended web directory. Common targets include WordPress configuration files containing database credentials, server configuration files, and log files that could be leveraged for log poisoning attacks. For detailed technical information, refer to the Patchstack security advisory.

Detection Methods for CVE-2025-49254

Indicators of Compromise

• HTTP requests to WordPress theme files containing directory traversal patterns such as ../ or encoded variants like %2e%2e%2f
• Web server access logs showing requests for sensitive system files through theme endpoints
• Unusual file access patterns in PHP error logs indicating failed inclusion attempts
• Requests containing null bytes or other bypass techniques targeting file inclusion parameters

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block directory traversal attempts in URL parameters and request bodies
• Implement file integrity monitoring on sensitive configuration files to detect unauthorized access attempts
• Configure intrusion detection systems (IDS) to alert on patterns associated with LFI exploitation
• Review WordPress access logs for suspicious requests targeting Nika theme files with unusual parameters

Monitoring Recommendations

• Enable verbose logging for PHP errors and monitor for file inclusion failures or warnings
• Set up alerts for repeated requests containing path traversal sequences from the same source
• Monitor web server logs for access attempts to sensitive files such as wp-config.php or system configuration files
• Implement rate limiting on theme endpoints to slow down automated exploitation attempts

How to Mitigate CVE-2025-49254

Immediate Actions Required

• Update the Nika WordPress theme to the latest available version that addresses this vulnerability
• If an update is not available, consider temporarily disabling or removing the Nika theme until a patch is released
• Review web server access logs for signs of exploitation attempts and investigate any suspicious activity
• Implement WAF rules to block common LFI attack patterns targeting the affected theme

Patch Information

Site administrators should check for theme updates through the WordPress dashboard or contact the theme developer (thembay) for information about patched versions. Monitor the Patchstack vulnerability database for updates on remediation status and patched version availability.

Workarounds

• Implement server-level restrictions using open_basedir PHP directive to limit file access to the WordPress installation directory
• Deploy ModSecurity or similar WAF with rules blocking directory traversal sequences in requests
• Restrict file permissions on sensitive configuration files to prevent reading by the web server user when possible
• Consider switching to an alternative WordPress theme until an official patch is released

# Configuration example - Add to Apache .htaccess or server config
# Block common LFI patterns in URL requests
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.%2f|%2e%2e/) [NC,OR]
RewriteCond %{QUERY_STRING} (etc/passwd|wp-config\.php) [NC]
RewriteRule .* - [F,L]

# PHP configuration to limit file access scope
# Add to php.ini or .user.ini
# open_basedir = /var/www/html/wordpress/