CVE-2026-46382 in mrbs-code
Summary
by MITRE • 08/13/2026
The Meeting Room Booking System (MRBS) is a PHP-based application for booking meeting rooms. Prior to version 1.12.2, a user-supplied private/local URI can be made to be fetched without checks. Version 1.12.2 contains a fix. No known workarounds are available.
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Analysis
by VulDB Data Team • 08/13/2026
The Meeting Room Booking System represents a common web application pattern used in enterprise environments for managing conference room reservations and scheduling resources. This PHP-based application serves as a digital booking interface that allows users to schedule meeting rooms while maintaining access controls and resource availability tracking. The system's architecture typically involves user authentication mechanisms, database interactions for storing booking information, and web interfaces for both administrative and regular user functions.
The vulnerability identified in MRBS versions prior to 1.12.2 stems from insufficient input validation and sanitization of URI parameters within the application's fetch mechanism. Specifically, the flaw allows an attacker to supply a private or local URI that gets processed without proper authorization checks or validation. This represents a classic server-side request forgery vulnerability where user-supplied input directly influences the system's ability to make HTTP requests to internal network resources. The vulnerability manifests when the application accepts and processes URI parameters without verifying their legitimacy or ensuring they point to authorized destinations.
The operational impact of this vulnerability extends beyond simple information disclosure, as it could potentially enable attackers to access internal systems that should remain isolated from external networks. An attacker could exploit this flaw to make unauthorized requests to internal services such as database servers, administrative interfaces, or other backend systems that might be accessible through the same network infrastructure. This creates a significant risk for organizations with poorly segmented networks where internal services are not properly protected from external access attempts.
From a cybersecurity perspective, this vulnerability aligns with CWE-918, which describes server-side request forgery vulnerabilities where applications make HTTP requests based on user-controllable input without proper validation. The attack pattern follows techniques described in the ATT&CK framework under T1190 for exploitation of remote services and potentially T1071 for application layer protocols. The lack of known workarounds indicates that organizations must upgrade to version 1.12.2 or later to achieve protection against this specific threat vector.
Organizations utilizing MRBS should implement immediate remediation measures by upgrading to the patched version 1.12.2 or newer releases, as no effective mitigations exist for the vulnerable versions. Network segmentation and firewall rules should be reviewed to limit access to internal services from the web application server. Additionally, input validation should be strengthened at multiple layers including application code, web application firewalls, and network-level controls to prevent similar vulnerabilities in other applications within the environment. Regular security assessments and vulnerability scanning should include checks for similar URI handling patterns across all web applications to ensure comprehensive protection against server-side request forgery attacks.