CVE-2026-13553: Hotel Management System RCE Vulnerability

CVE-2026-13553 Overview

CVE-2026-13553 is an unrestricted file upload vulnerability in itsourcecode Online Hotel Management System 1.0. The flaw resides in the /admin/mod_amenities/controller.php?action=add endpoint, where the image parameter accepts uploads without proper validation. Attackers can manipulate this parameter to upload arbitrary files remotely. The exploit has been published, increasing the likelihood of opportunistic attacks against exposed instances. This weakness is categorized under [CWE-284] (Improper Access Control) and affects confidentiality, integrity, and availability at a low level per the CVSS 4.0 assessment.

Critical Impact
Remote unauthenticated attackers can upload arbitrary files through the amenities controller, potentially leading to webshell deployment and further compromise of the hosting environment.

Affected Products

itsourcecode Online Hotel Management System 1.0
The vulnerable endpoint: /admin/mod_amenities/controller.php?action=add
The vulnerable parameter: image

Discovery Timeline

2026-06-29 - CVE-2026-13553 published to NVD
2026-06-29 - Last updated in NVD database

Technical Details for CVE-2026-13553

Vulnerability Analysis

The vulnerability affects the amenities management controller in itsourcecode Online Hotel Management System 1.0. When an administrator triggers the add action, the application accepts a file supplied via the image argument. The upload handler does not restrict file type, extension, or content, allowing attackers to submit arbitrary files including server-executable scripts. Because the endpoint sits within the /admin/ path, any deployment that fails to enforce authentication on this action allows unauthenticated remote exploitation. Successful upload of a PHP file to a web-accessible location results in code execution under the web server's privileges.

Root Cause

The root cause is missing access control and missing validation logic in the controller.php amenities handler. The application trusts the image upload without verifying the MIME type, extension, or file signature. This aligns with [CWE-284] where the resource permits actions that should be restricted to authorized principals with sanitized input.

Attack Vector

The attack is network-based and requires no privileges or user interaction. An attacker sends a crafted HTTP POST request to /admin/mod_amenities/controller.php?action=add with a malicious payload in the image field. Once the file is written to a predictable web-accessible directory, the attacker requests the uploaded resource to execute the payload. Public disclosure of the exploit through the GitHub CVE Issue Discussion and VulDB CVE-2026-13553 lowers the barrier for reproduction.

No verified proof-of-concept code is included here. Refer to the VulDB Vulnerability #374561 entry for technical exploitation details.

Detection Methods for CVE-2026-13553

Indicators of Compromise

HTTP POST requests to /admin/mod_amenities/controller.php?action=add originating from untrusted IP addresses.
Unexpected files with executable extensions (.php, .phtml, .phar) written under the amenities upload directory.
Web server processes spawning shells, curl, wget, or other download utilities shortly after file uploads.
Outbound connections from the web server to attacker-controlled infrastructure following upload activity.

Detection Strategies

Inspect web server access logs for POST requests to the vulnerable controller with abnormally large or script-like payloads.
Monitor file system events in upload directories for creation of files with server-executable extensions.
Alert on child processes of the PHP interpreter or web server that spawn command shells or system utilities.
Correlate uploads with subsequent HTTP GET requests targeting the newly created file to identify webshell execution attempts.

Monitoring Recommendations

Enable file integrity monitoring on all web-accessible directories used by the hotel management system.
Forward web server, PHP error, and system audit logs to a centralized platform for continuous correlation.
Baseline normal administrative traffic patterns so anomalous access to /admin/mod_amenities/ is quickly identified.

How to Mitigate CVE-2026-13553

Immediate Actions Required

Restrict network access to the /admin/ path using IP allowlisting or VPN-only exposure until a fix is applied.
Enforce authentication and session validation on controller.php for all action parameters, including add.
Audit the amenities upload directory for unauthorized files and remove any suspicious artifacts immediately.
Rotate administrative credentials and review web server accounts for signs of persistence.

Patch Information

No official vendor patch is referenced in the enriched CVE data at the time of publication. Consult the IT Source Code Security Resources page and the GitHub CVE Issue Discussion for updates from the maintainers.

Workarounds

Add server-side validation to reject files whose extensions or MIME types do not match an allowlist of image formats (.jpg, .png, .gif).
Store uploaded files outside the web root and serve them through a controller that sets safe Content-Type headers.
Configure the web server to disable PHP execution within upload directories using directives such as php_admin_flag engine off for Apache or equivalent location blocks in nginx.
Deploy a web application firewall rule blocking POST requests to /admin/mod_amenities/controller.php?action=add from unauthenticated sessions.

bash

# Example nginx configuration to block script execution in upload directories
location ~ ^/admin/mod_amenities/uploads/ {
    location ~ \.(php|phtml|phar)$ {
        deny all;
        return 403;
    }
}