Cross-Site Scripting in Online Hotel Management System

Executive Summary

CVE-2026-13556 is a Stored Cross-Site Scripting (XSS) vulnerability in the Online Hotel Management System version 1.0, specifically in the file /admin/mod_users/controller.php. The vulnerability arises because the application does not properly sanitize user input submitted via POST requests to the 'Name' field.

Attackers can inject malicious scripts, such as <img src=x onerror=alert(2)>, into the name field. This malicious input is stored permanently in the database and later displayed on HTML pages without proper escaping, causing the browser to execute the script.

This can lead to harmful actions like stealing cookies, hijacking user sessions, or other malicious activities. The attack can be initiated remotely and requires no authentication.

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Impact Analysis

This vulnerability can impact you by allowing attackers to execute malicious scripts in the context of your web application users' browsers.

• Stealing cookies, which can lead to session hijacking.
• Hijacking user sessions to impersonate legitimate users.
• Performing other harmful actions that the malicious script enables.

Since the vulnerability requires no authentication, any remote attacker can exploit it, increasing the risk of widespread attacks.

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Detection Guidance

This vulnerability can be detected by testing the input fields, specifically the 'Name' field in the /admin/mod_users/controller.php component, for improper input sanitization. You can attempt to inject typical XSS payloads such as <img src=x onerror=alert(2)> via POST requests and observe if the input is stored and executed when retrieved.

To detect this on your system, you can use tools like curl or Burp Suite to send crafted POST requests to the vulnerable endpoint and check if the payload is reflected or executed.

• Example curl command to test injection: curl -X POST -d "Name=<img src=x onerror=alert(2)>" https://your-target/admin/mod_users/controller.php?action=edit
• After injection, visit the page that displays the stored 'Name' field to see if the script executes.

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Mitigation Strategies

Immediate mitigation steps include implementing proper input validation and sanitization on the 'Name' field to prevent malicious scripts from being stored.

Additionally, apply output encoding or escaping when displaying user input in HTML pages to prevent execution of injected scripts.

• Validate and filter input to allow only expected characters.
• Encode output to neutralize any HTML or script content before rendering.
• Consider applying web application firewall (WAF) rules to block common XSS payloads.

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