CVE-2025-4763: Hotel Guest Hotspot XSS Vulnerability

CVE-2025-4763 Overview

A Reflected Cross-Site Scripting (XSS) vulnerability has been identified in Aida Computer Information Technology Inc.'s Hotel Guest Hotspot system. This web application vulnerability allows attackers to inject malicious scripts into web pages viewed by other users when they are on the same network segment. The vulnerability stems from improper neutralization of user-supplied input during web page generation.

The vendor was contacted early about this disclosure but did not respond in any way, leaving users potentially exposed until patches or workarounds are implemented.

Critical Impact

Attackers on the adjacent network can execute arbitrary JavaScript in victims' browsers, potentially leading to session hijacking, credential theft, or malicious redirection for hotel guests using the hotspot system.

Affected Products

• Hotel Guest Hotspot through version 22012026
• Aida Computer Information Technology Inc. Hotel Guest Hotspot software

Discovery Timeline

• 2026-01-22 - CVE-2025-4763 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2025-4763

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The Reflected XSS variant means that malicious scripts are reflected off a web server and executed in the victim's browser when they click a specially crafted link or submit a manipulated form.

In the context of a hotel guest hotspot system, this vulnerability is particularly concerning because it affects network infrastructure used by numerous transient users. The adjacent network attack vector indicates that an attacker must be on the same local network segment to exploit this vulnerability, which is a common scenario in hotel environments where guests share network infrastructure.

Root Cause

The root cause of this vulnerability is the failure to properly sanitize user-controlled input before including it in dynamically generated web pages. When the Hotel Guest Hotspot application processes user input—such as URL parameters, form fields, or HTTP headers—it fails to encode or escape special characters that have meaning in HTML and JavaScript contexts.

This allows attackers to craft malicious input containing script tags or JavaScript event handlers that are then rendered in the victim's browser as executable code rather than being displayed as harmless text.

Attack Vector

The attack vector for this Reflected XSS vulnerability requires the attacker to be on an adjacent network (the same hotel network segment as the victim). The attacker crafts a malicious URL containing JavaScript payload and tricks a victim into clicking it. When the victim accesses the URL through the Hotel Guest Hotspot portal, the malicious script executes in their browser session.

A typical exploitation scenario would involve an attacker on the hotel network sending a crafted link to other guests via the network's communication features, or placing the link on shared resources. When victims click the link while connected to the hotel hotspot, the malicious script executes with the privileges of their browser session.

The vulnerability manifests when user-supplied input is reflected back in HTTP responses without proper encoding. Attackers can inject JavaScript code through URL parameters that the application fails to sanitize. For detailed technical information, refer to the USOM Security Notification TR-26-0001.

Detection Methods for CVE-2025-4763

Indicators of Compromise

• Unusual URL patterns in web server logs containing encoded script tags (<script>, %3Cscript%3E) or JavaScript event handlers
• HTTP requests with suspicious payloads in query parameters targeting the Hotel Guest Hotspot portal
• Reports from users of unexpected browser behavior or pop-ups when using the hotspot system
• Network traffic showing exfiltration of session cookies or credentials to external domains

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common XSS patterns in HTTP requests
• Monitor web server access logs for requests containing script injection attempts
• Deploy browser-based security controls that detect suspicious JavaScript execution patterns
• Utilize network intrusion detection systems (IDS) configured with XSS attack signatures

Monitoring Recommendations

• Enable detailed logging on the Hotel Guest Hotspot application to capture all user input parameters
• Configure alerting for patterns indicative of XSS attacks in web application logs
• Monitor for unusual outbound connections from client browsers that may indicate successful exploitation
• Regularly review security logs for evidence of injection attempts targeting the hotspot portal

How to Mitigate CVE-2025-4763

Immediate Actions Required

• Isolate the Hotel Guest Hotspot system from direct internet access where possible
• Implement a Web Application Firewall with XSS filtering capabilities in front of the affected application
• Review and restrict network access controls to limit attack surface on adjacent network segments
• Consider deploying Content Security Policy (CSP) headers to mitigate script execution if server configuration allows

Patch Information

No vendor patch is currently available. The vendor (Aida Computer Information Technology Inc.) was contacted about this vulnerability but did not respond. Users should monitor for future updates and consider implementing compensating controls in the meantime.

For additional details, consult the USOM Security Notification TR-26-0001.

Workarounds

• Deploy a reverse proxy or WAF in front of the Hotel Guest Hotspot with strict input validation rules
• Implement HTTP response headers such as X-XSS-Protection: 1; mode=block and Content-Security-Policy to reduce exploitation impact
• Network segmentation to minimize the attack surface available to adjacent network attackers
• Consider temporary alternative solutions for guest network access until a vendor patch is available

# Example WAF configuration for Apache ModSecurity
# Add XSS filtering rules
SecRuleEngine On
SecRule ARGS "@detectXSS" "id:1,phase:2,deny,status:403,msg:'XSS Attack Detected'"
SecRule REQUEST_COOKIES|REQUEST_COOKIES_NAMES "@detectXSS" "id:2,phase:2,deny,status:403,msg:'XSS Attack Detected'"

# Add Content Security Policy header
Header set Content-Security-Policy "default-src 'self'; script-src 'self'"
Header set X-XSS-Protection "1; mode=block"
Header set X-Content-Type-Options "nosniff"