CVE-2025-54021: Simple File List Path Traversal Flaw

CVE-2025-54021 Overview

CVE-2025-54021 is a Path Traversal vulnerability (CWE-22) affecting the Simple File List plugin for WordPress, developed by Mitchell Bennis. This vulnerability allows attackers to traverse directory structures and access files outside the intended restricted directory, potentially leading to arbitrary file downloads from vulnerable WordPress installations.

The vulnerability stems from improper limitation of a pathname to a restricted directory, a common weakness that enables attackers to manipulate file path parameters to access sensitive files on the server filesystem.

Critical Impact

Attackers can exploit this path traversal vulnerability to download arbitrary files from the WordPress server, potentially exposing sensitive configuration files, database credentials, and other confidential data.

Affected Products

• Simple File List WordPress plugin versions up to and including 6.1.14
• WordPress installations using vulnerable versions of the Simple File List plugin

Discovery Timeline

• 2025-08-20 - CVE-2025-54021 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-54021

Vulnerability Analysis

This path traversal vulnerability exists in the Simple File List WordPress plugin, which is designed to provide file listing and management functionality within WordPress sites. The vulnerability allows attackers to bypass intended directory restrictions and access files outside the designated file list directory.

Path traversal attacks exploit insufficient input validation on file path parameters. When the plugin fails to properly sanitize user-supplied input containing directory traversal sequences (such as ../), attackers can navigate up the directory tree and access sensitive system files or WordPress configuration files.

The impact of this vulnerability is significant for WordPress installations using the affected plugin, as it could allow unauthorized access to sensitive files including wp-config.php, which contains database credentials and authentication keys.

Root Cause

The root cause of CVE-2025-54021 is the improper validation and sanitization of user-controlled file path input. The Simple File List plugin fails to adequately restrict pathname inputs to the intended directory, allowing directory traversal sequences to escape the restricted file path.

When processing file download or access requests, the plugin does not properly canonicalize paths or validate that the resolved file path remains within the allowed directory boundary. This allows attackers to construct malicious requests that reference files outside the intended scope.

Attack Vector

The attack vector for this vulnerability involves manipulating file path parameters in requests to the Simple File List plugin. An attacker can craft malicious requests containing directory traversal sequences to access files outside the intended directory.

A typical exploitation scenario involves:

1. Identifying a WordPress site running a vulnerable version of the Simple File List plugin
2. Crafting a request with directory traversal sequences (e.g., ../../../) in the file path parameter
3. Bypassing any weak path validation to access files outside the intended directory
4. Downloading sensitive files such as configuration files, logs, or backup files

The vulnerability enables arbitrary file download, which can expose sensitive information that may be leveraged for further attacks against the WordPress installation or underlying server.

Detection Methods for CVE-2025-54021

Indicators of Compromise

• Unusual file access patterns in web server logs showing directory traversal sequences (../, ..%2f, etc.)
• Requests to the Simple File List plugin endpoints containing encoded path traversal characters
• Access attempts targeting sensitive files like wp-config.php, .htaccess, or server configuration files
• Increased file download activity from unexpected source directories

Detection Strategies

• Monitor web server access logs for requests containing path traversal patterns targeting the Simple File List plugin
• Implement Web Application Firewall (WAF) rules to detect and block directory traversal attempts
• Deploy file integrity monitoring on sensitive WordPress configuration files
• Enable logging of all file access operations performed by WordPress plugins

Monitoring Recommendations

• Configure alerts for any requests containing directory traversal sequences in file path parameters
• Monitor for anomalous file download activity from the Simple File List plugin
• Review access logs regularly for signs of reconnaissance or exploitation attempts
• Implement centralized log collection for WordPress installations to facilitate threat hunting

How to Mitigate CVE-2025-54021

Immediate Actions Required

• Update the Simple File List plugin to the latest patched version immediately
• Review web server logs for any signs of exploitation attempts
• Audit file permissions to ensure sensitive files are not accessible via the web
• Consider temporarily disabling the Simple File List plugin until a patch can be applied

Patch Information

A security patch addressing this path traversal vulnerability is available. Site administrators should update the Simple File List plugin to a version newer than 6.1.14. The update should be applied through the WordPress admin dashboard or by manually downloading the latest version from the official WordPress plugin repository.

For detailed vulnerability information and patch status, refer to the Patchstack Vulnerability Advisory.

Workarounds

• Restrict access to the Simple File List plugin functionality to authenticated users only
• Implement server-level path validation to block requests containing directory traversal sequences
• Use a Web Application Firewall (WAF) to filter malicious requests targeting the plugin
• Move sensitive configuration files outside the web root where possible
• Apply the principle of least privilege to file system permissions for the web server user