CVE-2025-12593: Hotel Reservation System RCE Vulnerability

CVE-2025-12593 Overview

CVE-2025-12593 is an unrestricted file upload vulnerability in code-projects Simple Online Hotel Reservation System 2.0. The flaw resides in an unknown function within /admin/edit_room.php, specifically the Photo Handler component. Attackers can manipulate the photo upload functionality to bypass file type restrictions and upload arbitrary files to the server. The vulnerability is exploitable remotely over the network, though it requires high-privilege authentication. Public disclosure of the exploit technique increases the risk of opportunistic attacks against exposed deployments. The issue is tracked under [CWE-284] (Improper Access Control) and [CWE-434] (Unrestricted Upload of File with Dangerous Type).

Critical Impact
Authenticated administrators can upload arbitrary files through the Photo Handler in /admin/edit_room.php, potentially enabling webshell deployment and follow-on compromise of the hosting environment.

Affected Products

code-projects Simple Online Hotel Reservation System 2.0
Component: Photo Handler in /admin/edit_room.php
CPE: cpe:2.3:a:fabian:simple_online_hotel_reservation_system:2.0

Discovery Timeline

2025-11-02 - CVE-2025-12593 published to NVD
2026-04-29 - Last updated in NVD database

Technical Details for CVE-2025-12593

Vulnerability Analysis

The vulnerability exists in the room editing workflow of the Simple Online Hotel Reservation System. The /admin/edit_room.php script accepts file uploads through its Photo Handler to allow administrators to associate images with room listings. The handler fails to enforce restrictions on file extensions, MIME types, or content validation before persisting uploads to the web-accessible directory.

An attacker with administrative session access can submit a crafted multipart request containing a server-side script masquerading as an image. Once written to disk under the web root, the file can be executed by requesting its URL directly. The result is arbitrary code execution in the context of the web server process.

The attack requires high privileges, which limits exposure to scenarios where administrator credentials are compromised, default credentials remain in place, or a secondary flaw enables session takeover.

Root Cause

The root cause is missing input validation in the upload handler. The application trusts client-supplied file metadata and does not validate the uploaded content against an allowlist of safe image formats. There is no MIME sniffing, no extension allowlist enforcement, and no rewriting of uploaded filenames to non-executable extensions.

Attack Vector

The attack is network-based and requires an authenticated administrative session. An attacker submits a POST request to /admin/edit_room.php containing a malicious file disguised with an image-like filename or Content-Type header. The Photo Handler stores the file in a predictable location under the application directory, where the web server interprets it as executable code on subsequent requests.

The vulnerability mechanism is documented in the public GitHub writeup referenced in the GitHub CVE Documentation. No verified exploit code is included in this article.

Detection Methods for CVE-2025-12593

Indicators of Compromise

Unexpected files with executable extensions (.php, .phtml, .phar) in directories used by the Photo Handler under the application web root.
HTTP POST requests to /admin/edit_room.php containing multipart payloads with non-image file extensions or mismatched MIME types.
Outbound network connections originating from the web server process shortly after administrative upload activity.
Web server access logs showing GET requests to image directories returning dynamic content types instead of image/*.

Detection Strategies

Monitor web server logs for POST requests to /admin/edit_room.php and correlate with newly created files in the upload directory.
Deploy file integrity monitoring on directories writable by the web application to flag creation of script files.
Inspect uploaded files at the proxy or web application firewall layer for executable signatures regardless of declared MIME type.

Monitoring Recommendations

Enable verbose access logging on the /admin/ path and forward logs to a centralized analytics platform for behavioral baselining.
Alert on process creation events where the web server user spawns shells or interpreters such as sh, bash, or python.
Track administrative authentication events and correlate failed logins with subsequent successful uploads.

How to Mitigate CVE-2025-12593

Immediate Actions Required

Restrict access to /admin/edit_room.php to trusted IP ranges using web server access controls or a reverse proxy.
Rotate administrative credentials and enforce strong password policies to reduce the risk of unauthorized authenticated access.
Audit the upload directory for unexpected files and remove any script content that does not belong to the application.
Disable script execution in directories used for user-uploaded content through web server configuration.

Patch Information

No vendor advisory or official patch is available at the time of publication. Administrators should monitor the Code Projects Resource Hub for updates and consult the VulDB entry for additional tracking information.

Workarounds

Implement server-side validation that enforces an allowlist of image extensions and verifies file content using magic byte inspection.
Rename uploaded files to randomized identifiers and serve them through a handler that forces a static Content-Type such as image/jpeg.
Place uploaded files outside the web root and proxy them through a controlled download endpoint.
Deploy a web application firewall rule that blocks multipart uploads containing PHP tags or executable headers.

bash

# Apache configuration example to block script execution in upload directory
<Directory "/var/www/hotel/uploads">
    php_admin_flag engine off
    AddType text/plain .php .phtml .phar .php3 .php4 .php5 .php7
    <FilesMatch "\.(php|phtml|phar|php[3-7])$">
        Require all denied
    </FilesMatch>
</Directory>