CVE-2026-24953: Simple File List Path Traversal Flaw

CVE-2026-24953 Overview

A Path Traversal vulnerability has been identified in the Simple File List WordPress plugin developed by Mitchell Bennis. This vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory) allows authenticated attackers with low privileges to traverse outside restricted directories and download arbitrary files from the web server.

Critical Impact

Attackers with low-level privileges can exploit this vulnerability to access sensitive files outside the intended directory, potentially exposing configuration files, database credentials, or other confidential data stored on the WordPress server.

Affected Products

• Simple File List WordPress Plugin versions up to and including 6.1.15
• WordPress installations using vulnerable versions of the Simple File List plugin

Discovery Timeline

• 2026-02-20 - CVE CVE-2026-24953 published to NVD
• 2026-02-26 - Last updated in NVD database

Technical Details for CVE-2026-24953

Vulnerability Analysis

This vulnerability exists due to improper input validation in the Simple File List plugin's file download functionality. The plugin fails to adequately sanitize user-supplied input when processing file path requests, allowing an authenticated attacker to use path traversal sequences (such as ../) to escape the intended file directory structure.

The vulnerability requires network access and low-privilege authentication, making it accessible to any registered WordPress user. No user interaction is required for exploitation, and successful attacks result in high confidentiality impact, allowing attackers to read arbitrary files from the web server filesystem.

Root Cause

The root cause stems from inadequate input validation and path canonicalization in the plugin's file handling routines. The Simple File List plugin does not properly sanitize file path parameters before processing download requests, allowing directory traversal sequences to bypass intended access restrictions. This is a classic CWE-22 vulnerability where user-controlled input is directly incorporated into filesystem operations without proper validation.

Attack Vector

The attack vector is network-based, requiring authenticated access with minimal privileges. An attacker who has obtained low-level credentials (such as a WordPress subscriber account) can craft malicious requests containing path traversal sequences to access files outside the plugin's designated file storage directory.

The exploitation follows this pattern:

1. The attacker authenticates to the WordPress installation with any valid user account
2. The attacker identifies endpoints exposed by the Simple File List plugin for file downloads
3. Malicious requests containing path traversal sequences (e.g., ../../wp-config.php) are sent to the vulnerable endpoint
4. The plugin processes the request without proper path sanitization
5. The server returns the contents of files outside the intended directory

This arbitrary file download vulnerability can expose sensitive files including WordPress configuration files containing database credentials, plugin source code, user data, and other confidential information stored on the server.

Detection Methods for CVE-2026-24953

Indicators of Compromise

• Unusual file download requests containing path traversal sequences (../, ..%2f, %2e%2e/) in HTTP access logs
• Requests targeting system files or WordPress configuration files through the Simple File List plugin endpoints
• Authenticated users accessing files outside their normal usage patterns
• Log entries showing access to sensitive files like wp-config.php or /etc/passwd via plugin routes

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block path traversal patterns in request parameters
• Monitor HTTP access logs for requests containing encoded or plain path traversal sequences
• Enable WordPress security auditing to track file download activities through the Simple File List plugin
• Deploy endpoint detection solutions capable of identifying unusual file access patterns on web servers

Monitoring Recommendations

• Configure real-time alerting for requests containing directory traversal patterns targeting Simple File List endpoints
• Review authenticated user sessions for anomalous file download activities
• Implement file integrity monitoring on sensitive configuration files to detect unauthorized access attempts
• Enable verbose logging for the Simple File List plugin to capture detailed request information

How to Mitigate CVE-2026-24953

Immediate Actions Required

• Update Simple File List plugin to the latest patched version immediately
• Audit web server access logs for evidence of exploitation attempts
• Review and rotate any credentials that may have been exposed, particularly WordPress database credentials
• Temporarily disable the Simple File List plugin if an update is not yet available
• Restrict plugin access to only trusted administrator accounts until patching is complete

Patch Information

Users should update to the latest version of the Simple File List plugin that addresses this vulnerability. The fix involves implementing proper input validation and path canonicalization to prevent directory traversal attacks. For detailed vulnerability information and patch status, refer to the Patchstack Security Vulnerability Report.

Workarounds

• Implement server-level restrictions using .htaccess or web server configuration to block path traversal patterns
• Use a Web Application Firewall (WAF) to filter requests containing directory traversal sequences
• Restrict plugin functionality to administrator-level users only until a patch is applied
• Remove the plugin entirely if it is not critical to site operations
• Implement open_basedir restrictions in PHP configuration to limit filesystem access scope

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