CVE-2026-56059: Travel Booking Path Traversal Flaw

CVE-2026-56059 Overview

CVE-2026-56059 is an arbitrary file upload vulnerability affecting the WordPress Travel Booking theme in versions up to and including 2.2.5. The flaw allows authenticated users with only the Subscriber role to upload files without proper validation of file type or content. Because Subscriber accounts are the lowest privilege level in WordPress and are frequently open to public registration, this vulnerability effectively lowers the exploitation barrier to any attacker who can create an account. The issue is classified under CWE-434: Unrestricted Upload of File with Dangerous Type and is tracked by the Patchstack Vulnerability Advisory.

Critical Impact
An authenticated Subscriber can upload arbitrary files to the web server, enabling web shell deployment and remote code execution on affected WordPress sites.

Affected Products

WordPress Travel Booking theme versions <= 2.2.5
WordPress sites permitting Subscriber-level user registration
Any deployment of the Travel Booking theme prior to a fixed release

Discovery Timeline

2026-06-26 - CVE-2026-56059 published to NVD
2026-06-26 - Last updated in NVD database

Technical Details for CVE-2026-56059

Vulnerability Analysis

The Travel Booking theme exposes a file upload handler that fails to enforce restrictions on the file types accepted from authenticated users. The endpoint is reachable by users holding the Subscriber capability set, which is normally limited to reading content and editing profile data. An attacker with a Subscriber account can send a crafted upload request containing a PHP file or other executable server-side script. The uploaded file is written to a location within the WordPress web root, making it directly requestable through the browser. Successful exploitation yields remote code execution in the context of the web server user, providing a foothold to pivot into the database, steal credentials, or deploy persistent backdoors. The Exploit Prediction Scoring System places CVE-2026-56059 in the upper tier of currently monitored WordPress theme flaws.

Root Cause

The root cause is missing file-type and capability validation on the theme's upload handler. Per CWE-434, the application accepts files without verifying extension, MIME type, or content, and it does not restrict the handler to trusted administrative roles. No signature validation or extension allowlist is enforced before the file is written to disk.

Attack Vector

Exploitation requires network access to the WordPress site and a valid Subscriber account. The attacker authenticates, then issues a POST request to the vulnerable theme upload endpoint with a malicious payload such as a PHP web shell. Once written to the uploads directory, the attacker requests the file URL directly to execute arbitrary commands. No user interaction from an administrator is required, and the scope changes because uploaded code runs in the context of the WordPress process. Refer to the Patchstack advisory for further technical detail.

Detection Methods for CVE-2026-56059

Indicators of Compromise

Presence of .php, .phtml, or .phar files inside wp-content/uploads/ or theme-managed upload directories
POST requests to Travel Booking theme upload endpoints originating from low-privilege Subscriber accounts
Newly created WordPress user accounts followed shortly by file upload activity from the same session
Outbound network connections initiated by the PHP-FPM or web server process to unfamiliar IP addresses

Detection Strategies

Inspect web server access logs for HTTP 200 responses to wp-admin/admin-ajax.php or theme upload URLs from Subscriber sessions
File integrity monitoring on the wp-content/uploads/ and theme directories to alert on new executable file extensions
Static scanning of the uploads directory for PHP tags (<?php, <?=) inside files with image or document extensions

Monitoring Recommendations

Enable WordPress audit logging for user registration, role changes, and file upload events
Forward web server and PHP error logs to a centralized SIEM for correlation across authentication and upload events
Alert on any process spawned by the web server user that executes shell utilities such as sh, bash, wget, or curl

How to Mitigate CVE-2026-56059

Immediate Actions Required

Update the Travel Booking theme to a version later than 2.2.5 as soon as a patched release is available from the vendor
Disable open user registration or restrict the default new-user role away from Subscriber if registration is not required
Audit wp-content/uploads/ for unauthorized script files and remove any confirmed web shells
Rotate WordPress administrator credentials and API keys if compromise is suspected

Patch Information

Refer to the Patchstack Vulnerability Advisory for the fixed version and vendor guidance. Apply the theme update through the WordPress admin dashboard or via WP-CLI, then verify the installed version is greater than 2.2.5.

Workarounds

Block execution of PHP files within wp-content/uploads/ using a web server rule that denies script handlers in that path
Deploy a web application firewall rule that blocks multipart uploads containing PHP tags or executable extensions from non-administrator sessions
Temporarily deactivate the Travel Booking theme and switch to a default theme until a patched release is installed

bash

# Apache: deny PHP execution inside the WordPress uploads directory
# Place this in wp-content/uploads/.htaccess
<FilesMatch "\.(php|phtml|phar|php7|php8)$">
    Require all denied
</FilesMatch>

# Nginx equivalent inside the server block
location ~* /wp-content/uploads/.*\.(php|phtml|phar)$ {
    deny all;
    return 403;
}