CVE-2026-40746: Restaurant Zone File Upload Vulnerability

CVE-2026-40746 Overview

CVE-2026-40746 is an arbitrary file upload vulnerability affecting the Restaurant Zone WordPress theme in versions up to and including 0.7.8. The flaw allows authenticated users with subscriber-level privileges to upload files of arbitrary type to the WordPress installation. Successful exploitation leads to remote code execution on the underlying web server. The issue is tracked under CWE-434 (Unrestricted Upload of File with Dangerous Type) and was published to the National Vulnerability Database on June 17, 2026.

Critical Impact
A low-privileged subscriber account can upload executable files to a vulnerable WordPress site, leading to full server compromise.

Affected Products

Restaurant Zone WordPress theme versions <= 0.7.8
WordPress installations using the affected theme
Web servers hosting WordPress sites with Restaurant Zone enabled

Discovery Timeline

2026-06-17 - CVE-2026-40746 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-40746

Vulnerability Analysis

The Restaurant Zone theme exposes a file upload handler that fails to validate the type and extension of uploaded files. Any authenticated account, including the default subscriber role created through WordPress open registration, can reach the upload endpoint. Because WordPress allows registered visitors to obtain subscriber privileges by default on many sites, the practical attack surface is broad.

Attackers abuse the missing validation to upload PHP files or other server-executable content into the WordPress uploads directory. Once stored, the file can be requested directly through the web server to execute attacker-controlled code in the context of the web application user.

Root Cause

The root cause is improper input validation in the theme's file upload routine, classified as [CWE-434]. The handler does not enforce an allowlist of file extensions, does not verify MIME type against file content, and does not restrict access to administrative roles. The combination of weak authorization and missing content checks produces the arbitrary upload condition.

Attack Vector

Exploitation requires network access to the WordPress site and a subscriber-level account. The attack proceeds through the following stages:

The attacker registers or compromises a subscriber account on the target site.
The attacker submits a crafted multipart upload request to the vulnerable theme endpoint, attaching a PHP web shell.
The theme writes the file to a web-accessible directory under wp-content/uploads/.
The attacker requests the uploaded file directly, triggering code execution under the web server account.

No user interaction is required from administrators, and the scope changes because code executes outside the original WordPress permission boundary. Refer to the Patchstack Vulnerability Database Entry for additional technical context.

Detection Methods for CVE-2026-40746

Indicators of Compromise

New PHP, .phtml, or .phar files written under wp-content/uploads/ or theme-controlled directories
HTTP POST requests to Restaurant Zone theme endpoints from subscriber accounts containing multipart file payloads
Outbound connections from the web server process to unfamiliar hosts shortly after upload activity
Recently created WordPress user accounts with the subscriber role followed by upload requests

Detection Strategies

Inspect web server access logs for POST requests targeting Restaurant Zone theme PHP files, correlated with authenticated subscriber sessions.
Monitor the WordPress uploads directory for new files with executable extensions using file integrity monitoring.
Alert on web server worker processes (php-fpm, apache2, nginx) spawning child processes such as sh, bash, curl, or wget.

Monitoring Recommendations

Enable WordPress audit logging to track user registration, role changes, and theme-driven uploads.
Forward web server and PHP error logs to a centralized SIEM for correlation with authentication events.
Baseline outbound network traffic from web servers and alert on deviations following upload activity.

How to Mitigate CVE-2026-40746

Immediate Actions Required

Disable or remove the Restaurant Zone theme on any site running version 0.7.8 or earlier until a patched release is installed.
Disable open user registration or restrict the default registration role to a custom role without theme access.
Audit wp-content/uploads/ for executable files and remove any unauthorized content.
Rotate WordPress administrator credentials and review user accounts created in the period preceding detection.

Patch Information

At the time of publication, the Patchstack advisory lists Restaurant Zone versions <= 0.7.8 as affected. Site operators should monitor the Patchstack Vulnerability Database Entry for an official fixed version and apply the update immediately when available.

Workarounds

Block execution of PHP files within wp-content/uploads/ at the web server configuration layer.
Place a web application firewall rule in front of WordPress to reject multipart uploads to Restaurant Zone theme endpoints from non-administrative sessions.
Restrict file write permissions on the uploads directory to the minimum required by WordPress.

bash

# Apache: deny PHP execution inside wp-content/uploads
<Directory "/var/www/html/wp-content/uploads">
    <FilesMatch "\.(php|phtml|phar|php[0-9])$">
        Require all denied
    </FilesMatch>
</Directory>

# Nginx equivalent
location ~* /wp-content/uploads/.*\.(php|phtml|phar|php[0-9])$ {
    deny all;
    return 403;
}