CVE-2026-12277: WordPress File Manager Path Traversal Flaw

CVE-2026-12277 Overview

CVE-2026-12277 affects the Frontend File Manager Plugin for WordPress through version 23.6. The plugin fails to validate file paths derived from user input before deleting referenced files. Unauthenticated attackers can delete arbitrary files on the server when guest upload mode is enabled. Deleting wp-config.php forces the site into its setup routine, enabling a full site takeover by an attacker who completes the WordPress installation wizard with attacker-controlled database credentials.

Critical Impact
Unauthenticated arbitrary file deletion leading to site takeover through the WordPress setup routine when wp-config.php is removed.

Affected Products

Frontend File Manager Plugin for WordPress, versions through 23.6
WordPress sites with guest upload mode enabled
Any deployment exposing the plugin's file deletion endpoint to unauthenticated users

Discovery Timeline

2026-07-07 - CVE-2026-12277 published to NVD
2026-07-07 - Last updated in NVD database

Technical Details for CVE-2026-12277

Vulnerability Analysis

The vulnerability is a path traversal flaw leading to arbitrary file deletion. The plugin accepts a file path from user-supplied input and passes it to a deletion routine without validating that the path resolves to a location within the plugin's managed upload directory. Attackers supply relative path traversal sequences to reach files outside the intended scope.

When guest upload mode is enabled, no authentication is required to reach the vulnerable endpoint. The impact is amplified because WordPress reverts to its installation wizard when wp-config.php is absent. An attacker who accesses the setup page first can complete installation with attacker-controlled database credentials, granting administrative access to the site.

Root Cause

The plugin performs file deletion without canonicalizing the target path or restricting operations to an allow-listed directory. It also fails to enforce authentication or capability checks on the deletion handler when guest uploads are active. These two failures combine to permit unauthenticated arbitrary file deletion across the web server file system.

Attack Vector

The attack is network-based and requires no privileges or user interaction. The attacker sends a crafted HTTP request to the plugin's file deletion endpoint containing a path traversal payload targeting wp-config.php or another sensitive file. After deletion, the attacker requests the WordPress setup URL and completes installation with credentials they control.

See the WPScan Vulnerability Report for the disclosure details.

Detection Methods for CVE-2026-12277

Indicators of Compromise

HTTP requests to the Frontend File Manager Plugin endpoints containing ../ sequences or absolute paths referencing wp-config.php
Sudden absence of wp-config.php or unexpected access to the WordPress /wp-admin/setup-config.php installer
New administrator accounts created shortly after a file deletion event
Web server logs showing unauthenticated POST requests to plugin AJAX or REST endpoints from unfamiliar IP addresses

Detection Strategies

Alert on file system events showing deletion of wp-config.php, .htaccess, or other WordPress core files
Monitor web access logs for requests to plugin endpoints containing path traversal patterns such as ..%2f or ../
Detect requests to /wp-admin/install.php or setup-config.php on production sites where WordPress is already installed

Monitoring Recommendations

Enable file integrity monitoring on the WordPress installation directory
Forward web server and PHP error logs to a centralized logging platform for correlation
Track plugin version inventory across managed WordPress sites and flag installations at or below version 23.6

How to Mitigate CVE-2026-12277

Immediate Actions Required

Disable guest upload mode in the Frontend File Manager Plugin configuration
Deactivate the plugin on any site where an updated version is not yet available
Restrict access to plugin endpoints using web server rules or a web application firewall while a fix is validated
Back up wp-config.php and confirm file system permissions prevent web server-initiated deletion of core files

Patch Information

No fixed version is listed in the referenced advisory at the time of publication. Refer to the WPScan Vulnerability Report for updates on a patched release from the plugin author.

Workarounds

Turn off guest upload mode until a patched release is installed
Block requests to the plugin's deletion endpoints at the web application firewall for unauthenticated sessions
Set file system permissions so wp-config.php cannot be deleted by the PHP process user
Place a canary file within the WordPress root and alert on its removal to detect exploitation attempts

bash

# Configuration example: block path traversal to plugin endpoints in nginx
location ~* /wp-content/plugins/wp-file-manager/ {
    if ($args ~* "\.\./|%2e%2e%2f") { return 403; }
    if ($request_uri ~* "wp-config\.php") { return 403; }
}