CVE-2025-47439: Download Monitor LFI Vulnerability

CVE-2025-47439 Overview

CVE-2025-47439 is a PHP Local File Inclusion (LFI) vulnerability in the WP Chill Download Monitor plugin for WordPress. The flaw stems from improper control of filename parameters used in PHP include or require statements [CWE-98]. Authenticated attackers with low privileges can manipulate file path inputs to include arbitrary local PHP files on the server. This issue affects all versions of Download Monitor up to and including 5.0.22. Successful exploitation can lead to disclosure of sensitive configuration files, code execution via included files, and full compromise of WordPress installations.

Critical Impact
Authenticated attackers can include arbitrary local files within the PHP execution context, enabling information disclosure and potential remote code execution on affected WordPress sites.

Affected Products

WP Chill Download Monitor plugin for WordPress
All versions from initial release through 5.0.22
WordPress sites with the Download Monitor plugin installed and active

Discovery Timeline

2025-05-07 - CVE-2025-47439 published to the National Vulnerability Database
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-47439

Vulnerability Analysis

The vulnerability falls under [CWE-98]: Improper Control of Filename for Include/Require Statement in PHP Program. The Download Monitor plugin processes user-supplied input that is subsequently passed to a PHP file inclusion function without adequate validation or sanitization. While the original advisory categorizes the issue as Remote File Inclusion (RFI), the practical exploitation path is Local File Inclusion (LFI) because typical PHP configurations disable allow_url_include.

An authenticated attacker can supply a crafted filename or path traversal sequence that causes the plugin to load a local PHP file outside the intended directory. Once included, the contents of that file execute within the plugin's request context. Attackers can leverage this to read configuration files containing database credentials, execute previously uploaded payloads, or pivot to log poisoning techniques for code execution.

Root Cause

The root cause is the absence of strict allowlisting or canonicalization of file path parameters before they reach a PHP include, require, include_once, or require_once call. The plugin trusts a parameter that should have been constrained to a known set of safe resource identifiers.

Attack Vector

Exploitation requires network access to the WordPress site and authenticated session with low privileges. The attacker submits a request containing a manipulated file path parameter to a vulnerable plugin endpoint. The high attack complexity reflects the conditions required to reach the vulnerable code path. Detailed technical analysis is available in the Patchstack WordPress Plugin Vulnerability advisory.

Detection Methods for CVE-2025-47439

Indicators of Compromise

HTTP requests to Download Monitor plugin endpoints containing directory traversal sequences such as ../ or encoded variants like %2e%2e%2f
Access patterns referencing sensitive local files including wp-config.php, /etc/passwd, or PHP session files
Unexpected inclusion of files from /tmp, upload directories, or log paths within PHP error logs
Authenticated user sessions issuing repeated parameter manipulation attempts against download-monitor URLs

Detection Strategies

Inspect web server access logs for query string parameters containing path traversal patterns directed at Download Monitor endpoints
Enable PHP error logging and review entries referencing include() or require() calls with unexpected paths
Deploy web application firewall (WAF) rules targeting LFI signatures on WordPress administrative requests
Correlate authenticated user activity with anomalous file access events on the underlying host

Monitoring Recommendations

Monitor outbound traffic from the WordPress host for unexpected data exfiltration following suspicious requests
Alert on read operations targeting wp-config.php from the web server process outside normal application flow
Track plugin version inventory across WordPress installations and flag any running Download Monitor 5.0.22 or earlier

How to Mitigate CVE-2025-47439

Immediate Actions Required

Update the Download Monitor plugin to the latest fixed version released by WP Chill after 5.0.22
Audit user accounts and revoke unnecessary privileges that could be abused to authenticate and reach the vulnerable endpoint
Review web server and PHP logs for prior exploitation attempts referencing path traversal or unusual file inclusions
Rotate WordPress credentials, database passwords, and any secrets stored in wp-config.php if compromise is suspected

Patch Information

Users should upgrade Download Monitor to a version newer than 5.0.22. Refer to the Patchstack advisory for the vendor's patched release information and confirm the update through the WordPress plugin management dashboard.

Workarounds

Disable or remove the Download Monitor plugin until the patched version can be applied
Restrict access to WordPress administrative endpoints using IP allowlisting at the web server or WAF layer
Ensure allow_url_include and allow_url_fopen remain disabled in php.ini to limit inclusion to local files only
Apply virtual patching through a WAF with rules that block path traversal sequences in plugin parameters

bash

# Configuration example: harden PHP against file inclusion abuse
# /etc/php/php.ini
allow_url_include = Off
allow_url_fopen = Off
open_basedir = "/var/www/html:/tmp"

# Update Download Monitor via WP-CLI
wp plugin update download-monitor
wp plugin list --name=download-monitor --fields=name,status,version