CVE-2026-5705 Overview
A Cross-Site Scripting (XSS) vulnerability has been identified in code-projects Online Hotel Booking 1.0. This vulnerability affects the /booknow.php file within the Booking Endpoint component. Manipulation of the roomname parameter allows attackers to inject malicious scripts that execute in victims' browsers. The attack can be launched remotely, and exploit code is publicly available.
Critical Impact
Remote attackers can inject malicious scripts via the roomname parameter, potentially leading to session hijacking, credential theft, or redirection to malicious sites for users interacting with the hotel booking system.
Affected Products
- code-projects Online Hotel Booking 1.0
- Booking Endpoint component (/booknow.php)
- Web applications using the vulnerable roomname parameter handling
Discovery Timeline
- 2026-04-07 - CVE-2026-5705 published to NVD
- 2026-04-07 - Last updated in NVD database
Technical Details for CVE-2026-5705
Vulnerability Analysis
This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting (XSS). The flaw exists in how the Online Hotel Booking application processes user-supplied input through the roomname parameter in the /booknow.php endpoint.
When a user submits booking information, the application fails to properly sanitize or encode the roomname parameter before reflecting it back in the HTTP response. This allows an attacker to craft a malicious URL containing JavaScript code that executes in the context of a victim's browser session when they click the link.
The reflected nature of this XSS vulnerability means attackers must social engineer victims into clicking specially crafted links. Once executed, the malicious script runs with the same privileges as the legitimate application, enabling attackers to access session cookies, DOM content, and perform actions on behalf of the authenticated user.
Root Cause
The root cause is improper input validation and output encoding in the /booknow.php file. The roomname parameter is directly incorporated into the HTTP response without sanitization, allowing HTML and JavaScript injection. The application lacks essential security controls including input validation, output encoding, and Content Security Policy headers.
Attack Vector
This vulnerability exploits a network-based attack vector requiring user interaction. An attacker crafts a malicious URL containing JavaScript payload in the roomname parameter and distributes it via phishing emails, social media, or compromised websites. When a victim clicks the link, the booking application reflects the malicious input directly into the response page. The injected script executes in the victim's browser context, potentially stealing session tokens, redirecting users, or performing unauthorized actions.
The attack requires no authentication or special privileges, making it accessible to any remote attacker who can distribute the malicious link to potential victims.
Detection Methods for CVE-2026-5705
Indicators of Compromise
- Unusual URL patterns in web server logs containing encoded JavaScript in the roomname parameter of /booknow.php requests
- Presence of script tags, event handlers (onclick, onerror, onload), or JavaScript URIs in HTTP request parameters
- Unexpected outbound connections from client browsers to unknown domains after visiting the booking system
- User reports of unexpected behavior or redirects when using the hotel booking functionality
Detection Strategies
- Implement Web Application Firewall (WAF) rules to detect and block common XSS payloads in the roomname parameter
- Enable detailed logging of all requests to /booknow.php and monitor for suspicious character sequences such as <script>, javascript:, or encoded variants
- Deploy browser-based detection mechanisms that alert on attempted DOM manipulation from untrusted sources
- Conduct regular vulnerability scanning of the Online Hotel Booking application using automated tools
Monitoring Recommendations
- Configure SIEM alerts for multiple requests to /booknow.php with special characters or encoded payloads from the same source IP
- Monitor client-side JavaScript errors and unexpected DOM modifications through browser telemetry
- Track user session anomalies following interactions with the booking endpoint
- Review referrer headers for suspicious external sources linking to booking URLs with parameters
How to Mitigate CVE-2026-5705
Immediate Actions Required
- Implement server-side input validation to whitelist acceptable characters for the roomname parameter
- Apply proper output encoding (HTML entity encoding) before reflecting user input in HTTP responses
- Deploy Content Security Policy (CSP) headers to restrict inline script execution
- Consider temporarily disabling the booking functionality if a patch is not immediately available
Patch Information
No official vendor patch information is currently available. Organizations using code-projects Online Hotel Booking 1.0 should monitor the Code Projects Security Resources for updates. Additional technical details about this vulnerability can be found in the GitHub XSS Vulnerability Report and VulDB Vulnerability #355521.
Workarounds
- Implement a Web Application Firewall (WAF) with XSS filtering rules to block malicious payloads targeting /booknow.php
- Add server-side input validation to strip or reject requests containing HTML tags or JavaScript in the roomname parameter
- Deploy CSP headers with script-src 'self' to prevent inline script execution as a defense-in-depth measure
- Manually patch the /booknow.php file to implement htmlspecialchars() or equivalent encoding on the roomname parameter before output
# Example Apache ModSecurity rule to block XSS in roomname parameter
SecRule ARGS:roomname "@rx (?i)(<script|javascript:|on\w+\s*=)" \
"id:100001,phase:2,deny,status:403,msg:'XSS attempt blocked in roomname parameter'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
