CVE-2025-39406: WPAMS PHP File Inclusion Vulnerability

CVE-2025-39406 Overview

CVE-2025-39406 is a Local File Inclusion (LFI) vulnerability affecting the WPAMS (WordPress Apartment Management System) plugin developed by mojoomla. The vulnerability stems from improper control of filename for include/require statements in PHP, classified under CWE-98. This flaw allows unauthenticated attackers to include arbitrary local files on the server, potentially leading to privilege escalation, sensitive data exposure, and in certain configurations, remote code execution.

Critical Impact

This vulnerability allows unauthenticated attackers to exploit PHP Local File Inclusion to achieve privilege escalation, potentially gaining administrative access to WordPress installations running vulnerable versions of WPAMS.

Affected Products

• WPAMS (WordPress Apartment Management System) plugin versions through 44.0
• WordPress installations with vulnerable WPAMS plugin installed
• Websites using mojoomla WPAMS for property/apartment management

Discovery Timeline

• 2025-05-19 - CVE-2025-39406 published to NVD
• 2025-05-21 - Last updated in NVD database

Technical Details for CVE-2025-39406

Vulnerability Analysis

The vulnerability exists in the WPAMS WordPress plugin due to improper validation and sanitization of user-supplied input that is used in PHP include() or require() statements. When an attacker can control the filename parameter passed to these PHP functions, they can manipulate the path to include arbitrary files from the local filesystem.

In the context of this vulnerability, the LFI can be chained to achieve privilege escalation within WordPress. This typically occurs when an attacker includes sensitive configuration files (such as wp-config.php) to extract database credentials, or leverages log poisoning techniques to execute arbitrary PHP code.

The network-accessible nature of this vulnerability, combined with the lack of authentication requirements and no user interaction needed, makes it particularly dangerous for internet-facing WordPress installations.

Root Cause

The root cause of CVE-2025-39406 is the failure to properly validate and sanitize user-controlled input before using it in PHP file inclusion operations. The WPAMS plugin accepts filename or path parameters without adequate checks for directory traversal sequences (such as ../) or validation against an allowlist of permitted files. This allows attackers to escape the intended directory context and access files elsewhere on the filesystem.

Attack Vector

The attack vector for this vulnerability is network-based, meaning remote attackers can exploit it without local access to the target system. The exploitation flow typically involves:

1. Identifying a vulnerable endpoint in the WPAMS plugin that accepts file path input
2. Crafting a malicious request containing directory traversal sequences
3. Including sensitive system files or WordPress configuration files
4. Extracting credentials or session tokens for privilege escalation
5. Potentially achieving code execution through log poisoning or other LFI-to-RCE techniques

The vulnerability can be exploited by sending specially crafted HTTP requests to the vulnerable WordPress site. Attackers manipulate parameters to traverse directories and include arbitrary local files. For technical exploitation details, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-39406

Indicators of Compromise

• Unusual HTTP requests containing path traversal sequences (../, ..%2f, ..%252f) targeting WPAMS plugin endpoints
• Web server access logs showing requests attempting to access /etc/passwd, wp-config.php, or other sensitive files via plugin parameters
• Unexpected file access patterns in WordPress plugin directories
• Evidence of privilege escalation such as new administrator accounts or modified user roles

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal patterns in HTTP requests
• Monitor web server access logs for requests containing encoded or plain-text directory traversal sequences targeting the WPAMS plugin
• Deploy file integrity monitoring on sensitive WordPress configuration files
• Configure intrusion detection systems to alert on LFI attack signatures

Monitoring Recommendations

• Enable verbose logging for the WordPress application and review logs for suspicious file inclusion attempts
• Set up real-time alerting for access to sensitive files like wp-config.php from unexpected sources
• Monitor for unusual PHP error messages that may indicate failed file inclusion attempts
• Track user privilege changes in WordPress to detect successful escalation attacks

How to Mitigate CVE-2025-39406

Immediate Actions Required

• Update the WPAMS plugin to the latest patched version immediately if a fix is available
• If no patch is available, consider temporarily disabling the WPAMS plugin until a fix is released
• Implement WAF rules to block path traversal attempts targeting the vulnerable plugin
• Audit WordPress user accounts for any unauthorized privilege escalations or new administrator accounts
• Review web server logs for evidence of prior exploitation attempts

Patch Information

Users should check the official WordPress plugin repository and mojoomla's website for updated versions of the WPAMS plugin that address this vulnerability. The vulnerability affects all versions through 44.0, so any version at or below this number should be considered vulnerable. Consult the Patchstack vulnerability report for the latest patch status and remediation guidance.

Workarounds

• Disable the WPAMS plugin entirely if it is not critical to site operations until a patch is available
• Implement strict WAF rules to filter requests containing path traversal patterns (e.g., ../, URL-encoded variants)
• Restrict access to the WordPress admin and plugin directories using .htaccess or web server configuration
• Apply the principle of least privilege to the web server user to limit the impact of successful file inclusion attacks
• Consider using PHP open_basedir directive to restrict file access to the WordPress installation directory

# Example .htaccess rule to block path traversal attempts
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.%2f|\.\.%252f) [NC,OR]
RewriteCond %{REQUEST_URI} (\.\./|\.\.%2f|\.\.%252f) [NC]
RewriteRule .* - [F,L]