CVE-2025-32288: RT-Theme 18 Extensions File Inclusion Flaw

CVE-2025-32288 Overview

CVE-2025-32288 is an Improper Control of Filename for Include/Require Statement in PHP Program vulnerability affecting the RT-Theme 18 Extensions (rt18-extensions) WordPress plugin developed by stmcan. This Local File Inclusion (LFI) vulnerability allows attackers to include arbitrary local files on the server, potentially leading to sensitive information disclosure, configuration file exposure, or in certain scenarios, remote code execution through log poisoning or other chained attacks.

Critical Impact

This PHP Local File Inclusion vulnerability enables attackers to read sensitive files from the server, potentially exposing database credentials, configuration files, and other confidential data. In advanced attack scenarios, this could be chained with other techniques to achieve remote code execution.

Affected Products

• RT-Theme 18 | Extensions (rt18-extensions) WordPress Plugin versions through 2.4
• WordPress installations using vulnerable versions of the rt18-extensions plugin

Discovery Timeline

• 2025-08-14 - CVE-2025-32288 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-32288

Vulnerability Analysis

This vulnerability is classified under CWE-98 (Improper Control of Filename for Include/Require Statement in PHP Program). The RT-Theme 18 Extensions plugin fails to properly sanitize user-supplied input before using it in PHP include or require statements. This allows an attacker to manipulate file path parameters to include arbitrary local files from the web server's filesystem.

The attack can be initiated over the network, though it requires user interaction and presents some complexity in exploitation. Successful exploitation could result in complete compromise of confidentiality, integrity, and availability of the affected system. Attackers may be able to read sensitive configuration files such as wp-config.php, access database credentials, or traverse the filesystem to expose other critical application and system files.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and sanitization within the RT-Theme 18 Extensions plugin. The plugin uses user-controllable input directly or with inadequate filtering in PHP file inclusion functions (include, require, include_once, or require_once). Without proper path validation, whitelist filtering, or basename restrictions, attackers can inject directory traversal sequences (such as ../) to access files outside the intended directory scope.

Attack Vector

The vulnerability is exploited via network-based requests to the WordPress site running the vulnerable plugin. An attacker crafts malicious requests containing path traversal sequences or manipulated file path parameters that are processed by the plugin's file inclusion logic. The attack scenario involves:

1. Identifying a vulnerable WordPress installation running RT-Theme 18 Extensions version 2.4 or earlier
2. Crafting HTTP requests with manipulated parameters targeting the vulnerable inclusion mechanism
3. Using directory traversal sequences to escape the intended directory and access sensitive files
4. Reading the contents of system files, configuration files, or other sensitive data

For detailed technical information about this vulnerability, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2025-32288

Indicators of Compromise

• HTTP requests containing directory traversal patterns such as ../, ..%2f, or encoded variants targeting plugin endpoints
• Access logs showing attempts to read sensitive files like /etc/passwd, wp-config.php, or .htaccess
• Unusual file access patterns in server logs, particularly targeting the rt18-extensions plugin directory
• Error logs indicating failed file inclusion attempts with unexpected paths

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block directory traversal sequences in request parameters
• Monitor HTTP request logs for patterns matching Local File Inclusion attacks targeting WordPress plugins
• Deploy file integrity monitoring to detect unauthorized access to sensitive configuration files
• Use intrusion detection systems (IDS) with signatures for PHP LFI exploitation attempts

Monitoring Recommendations

• Enable verbose logging for the WordPress application and web server to capture detailed request information
• Configure alerts for access attempts to sensitive files such as wp-config.php or system files
• Review web server access logs regularly for suspicious activity involving the rt18-extensions plugin paths
• Implement real-time monitoring for anomalous file access patterns on the server

How to Mitigate CVE-2025-32288

Immediate Actions Required

• Update the RT-Theme 18 Extensions plugin to a patched version as soon as one becomes available from the vendor
• Temporarily disable the rt18-extensions plugin if it is not critical to site functionality
• Implement WAF rules to block requests containing path traversal sequences targeting the vulnerable endpoints
• Review server access logs for any evidence of prior exploitation attempts
• Audit file permissions to ensure sensitive files have restricted access

Patch Information

At the time of this analysis, organizations should monitor the official RT-Theme 18 Extensions plugin page and the Patchstack advisory for updates regarding a security patch. Update to a version newer than 2.4 when available.

Workarounds

• Disable or remove the RT-Theme 18 Extensions plugin if it is not essential to your WordPress site's functionality
• Implement server-level restrictions using .htaccess or web server configuration to restrict access to the plugin's vulnerable endpoints
• Deploy a Web Application Firewall with rules specifically designed to block LFI/path traversal attack patterns
• Apply the principle of least privilege to file system permissions, ensuring PHP processes cannot read sensitive files outside the web root

# Example .htaccess rule to block common LFI patterns
<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{QUERY_STRING} (\.\./|\.\.\\) [NC,OR]
    RewriteCond %{QUERY_STRING} (etc/passwd|wp-config\.php) [NC]
    RewriteRule .* - [F,L]
</IfModule>