CVE-2026-14560: WordPress Teddy Bear Customize RCE Flaw

CVE-2026-14560 Overview

The Teddy Bear Customize Addon WordPress plugin through version 1.0.5 contains an unauthenticated arbitrary file upload vulnerability. The plugin fails to validate uploaded files, trusting a client-supplied Content-Type header while preserving the attacker-controlled original filename. Unauthenticated remote attackers can upload PHP files and execute arbitrary code on the underlying web server. The flaw is tracked under CWE-94: Improper Control of Generation of Code and results in full compromise of the WordPress host.

Critical Impact
Any unauthenticated attacker with network access to a vulnerable WordPress site can upload a PHP webshell and achieve remote code execution as the web server user.

Affected Products

Teddy Bear Customize Addon WordPress plugin, all versions up to and including 1.0.5
WordPress installations with the plugin activated and reachable over HTTP or HTTPS
Downstream web application stacks (PHP-FPM, Apache, Nginx) hosting the vulnerable plugin

Discovery Timeline

2026-09-11 - CVE-2026-14560 published to the National Vulnerability Database
2026-09-11 - Last updated in NVD database

Technical Details for CVE-2026-14560

Vulnerability Analysis

The plugin exposes an upload endpoint that accepts files without server-side validation of the file extension or actual content. According to the WPScan Vulnerability Report, the handler inspects only the Content-Type header supplied by the client and then writes the file to a web-accessible directory using the original filename. Attackers can submit a request with Content-Type: image/png while sending a .php file, and the server persists the file with its executable extension intact. Because no authentication is required, exploitation reduces to a single HTTP POST request against the vulnerable endpoint.

Root Cause

The root cause is missing server-side input validation on file uploads, categorized as CWE-94: Improper Control of Generation of Code. Two defects combine to make exploitation trivial. First, the plugin relies on a client-supplied MIME type rather than inspecting file magic bytes or enforcing an extension allowlist. Second, it preserves the attacker-controlled filename instead of generating a random, sanitized name with a safe extension. The absence of an authentication or capability check on the upload endpoint removes the last barrier to exploitation.

Attack Vector

Exploitation is performed over the network without authentication or user interaction. An attacker crafts a multipart HTTP POST request targeting the plugin's upload endpoint, sets Content-Type to an image MIME type, and includes a PHP payload with a .php filename. After the file lands under the WordPress uploads directory, the attacker requests the uploaded URL directly, causing PHP to execute the payload. This yields code execution as the web server user, enabling database theft, lateral movement, and persistence through additional webshells or scheduled tasks. The vulnerability is scoped as changed, meaning the impact extends beyond the vulnerable component to the entire hosting environment.

Detection Methods for CVE-2026-14560

Indicators of Compromise

Files with .php, .phtml, .phar, or double extensions such as .jpg.php present under wp-content/uploads/ or any directory written to by the Teddy Bear Customize Addon plugin
Unauthenticated HTTP POST requests to plugin upload endpoints followed by GET requests to newly created files in the uploads directory
Web server processes (www-data, apache, nginx, php-fpm) spawning shells, curl, wget, or outbound network connections to unknown hosts
New WordPress administrator accounts, modified wp-config.php, or unexpected cron entries created shortly after upload activity

Detection Strategies

Audit the WordPress uploads directory recursively for executable script extensions using find wp-content/uploads -type f $ -name "*.php*" -o -name "*.phtml" $
Inspect web server access logs for POST requests carrying multipart form data with filenames ending in scripting extensions
Correlate file creation events in the uploads path with subsequent process creation events from the PHP interpreter
Enable file integrity monitoring on wp-content/ to alert on any newly written PHP files outside of legitimate plugin or theme updates

Monitoring Recommendations

Forward WordPress, PHP-FPM, and web server logs to a centralized analytics platform for correlation across upload, execution, and outbound connection events
Alert on any child process of php-fpm, httpd, or nginx that invokes /bin/sh, bash, python, perl, or network utilities
Track HTTP responses of 200 to PHP files located inside upload directories, which is atypical for a hardened WordPress deployment
Monitor for creation or modification of WordPress administrator accounts and plugin files outside of scheduled maintenance windows

How to Mitigate CVE-2026-14560

Immediate Actions Required

Deactivate and remove the Teddy Bear Customize Addon plugin from all WordPress sites until a fixed version is released by the vendor
Review the wp-content/uploads/ directory for unauthorized PHP files and remove any that are identified as webshells
Rotate WordPress administrator passwords, database credentials, and API keys stored in wp-config.php if compromise is suspected
Restore the site from a known-good backup if webshell activity or unauthorized administrator accounts are found

Patch Information

At the time of publication, no fixed version is listed for the Teddy Bear Customize Addon plugin. The WPScan Vulnerability Report tracks the issue against all versions through 1.0.5. Administrators should monitor the WordPress plugin repository and the vendor's page for an updated release, and remove the plugin in the interim.

Workarounds

Block execution of PHP inside upload directories by adding a web server rule such as <FilesMatch "\.ph(p[3457]?|t|tml|ar)$">Require all denied</FilesMatch> in Apache or a matching location block in Nginx
Deploy a web application firewall rule to reject multipart uploads whose filename ends in a scripting extension regardless of Content-Type
Restrict access to the plugin's upload endpoint at the reverse proxy layer to trusted IP ranges only
Enforce filesystem permissions that prevent the web server user from writing files with executable script extensions to public directories

bash

# Nginx configuration to block PHP execution in the WordPress uploads directory
location ~* /wp-content/uploads/.*\.(php|phtml|phar|php[3457])$ {
    deny all;
    return 403;
}