CVE-2026-6492: Hotel Booking System Disclosure Flaw

CVE-2026-6492 Overview

A sensitive information disclosure vulnerability has been identified in the arnobt78 Hotel Booking Management System. The vulnerability exists in the /api/health/detailed endpoint of the Health Check component, allowing unauthenticated remote attackers to access sensitive system information. This exposure could provide attackers with valuable reconnaissance data that may be leveraged for further attacks against the application or underlying infrastructure.

Critical Impact

Remote attackers can access sensitive system information through the unprotected health check endpoint without authentication, potentially exposing internal configuration details, system status, and other sensitive data that aids in reconnaissance for further exploitation.

Affected Products

• arnobt78 Hotel Booking Management System (up to commit f8922d0e0f6ac1cc761974c7616f44c2bbc04bea)

Discovery Timeline

• 2026-04-17 - CVE CVE-2026-6492 published to NVD
• 2026-04-22 - Last updated in NVD database

Technical Details for CVE-2026-6492

Vulnerability Analysis

This vulnerability is classified as CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). The Hotel Booking Management System exposes a detailed health check endpoint at /api/health/detailed that does not implement proper access controls. When accessed, this endpoint returns sensitive information about the system's internal state, configuration, or operational details.

The vulnerability is particularly concerning because health check endpoints are commonly used for monitoring purposes and often contain detailed information about database connections, service status, memory usage, environment variables, and other internal configuration data. Without proper authentication or authorization controls, this information becomes accessible to any remote attacker who can reach the endpoint.

A proof-of-concept exploit has been publicly disclosed, demonstrating the exploitability of this vulnerability. The vendor was contacted regarding this disclosure but did not respond.

Root Cause

The root cause of this vulnerability is improper access control implementation on the /api/health/detailed endpoint. The application fails to verify that requests to this sensitive endpoint originate from authorized users or internal monitoring systems. This represents a failure to implement the principle of least privilege, where detailed system health information is exposed without requiring authentication or network-level restrictions.

Attack Vector

The attack can be executed remotely over the network without requiring any user interaction or prior authentication. An attacker simply needs to send an HTTP request to the /api/health/detailed endpoint to retrieve sensitive system information.

The attack flow involves:

1. Attacker identifies the Hotel Booking Management System instance
2. Attacker sends an unauthenticated HTTP GET request to /api/health/detailed
3. The server responds with detailed health information containing sensitive data
4. Attacker analyzes the response to gather intelligence for further attacks

For technical details and proof-of-concept, refer to the GitHub PoC Repository.

Detection Methods for CVE-2026-6492

Indicators of Compromise

• Unusual or excessive HTTP requests to /api/health/detailed endpoint from external IP addresses
• Access logs showing requests to health check endpoints from non-monitoring infrastructure
• Network traffic analysis revealing sensitive system data being transmitted to external destinations

Detection Strategies

• Monitor web server access logs for requests to /api/health/detailed from unauthorized source IPs
• Implement alerting for any external access attempts to health check endpoints
• Deploy web application firewalls (WAF) with rules to detect and block reconnaissance patterns targeting diagnostic endpoints
• Review application logs for patterns indicating systematic endpoint enumeration

Monitoring Recommendations

• Configure SIEM rules to alert on access to sensitive diagnostic endpoints from non-whitelisted IP ranges
• Implement network segmentation to ensure health check endpoints are only accessible from internal monitoring systems
• Establish baseline access patterns to health endpoints and alert on deviations

How to Mitigate CVE-2026-6492

Immediate Actions Required

• Restrict access to /api/health/detailed endpoint using authentication or IP-based access controls
• Consider disabling the detailed health endpoint if not required for operations
• Review all diagnostic and health check endpoints for similar exposure issues
• Implement network-level restrictions to limit access to monitoring endpoints

Patch Information

The Hotel Booking Management System follows a rolling release approach with continuous delivery, so specific version information for patched releases is not available. The vendor was contacted about this vulnerability but did not respond. Organizations using this software should:

1. Check the project repository for any commits addressing this issue after f8922d0e0f6ac1cc761974c7616f44c2bbc04bea
2. Implement the workarounds below until a fix is confirmed
3. Consider forking and patching the application if it remains unaddressed

Additional details are available in the VulDB entry.

Workarounds

• Add authentication requirements to the /api/health/detailed endpoint at the application or reverse proxy level
• Implement IP whitelisting to restrict health endpoint access to internal monitoring systems only
• Use a reverse proxy or web application firewall to block external requests to /api/health/* paths
• Create a minimal health endpoint that returns only operational status without sensitive details