CVE-2026-89175 in EH3040
Summary
by MITRE • 09/11/2026
Smart Video Intercom System developed by Kingdom Communication Associated has a Client-Side Authentication vulnerability. Unauthenticated remote attackers can bypass authentication to access specific pages and obtain partial system configuration values.
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Analysis
by VulDB Data Team • 09/11/2026
The Smart Video Intercom System manufactured by Kingdom Communication Associated contains a critical client-side authentication flaw that fundamentally undermines the integrity of its security architecture. This vulnerability stems from an improper implementation of access control mechanisms, where sensitive administrative functions or configuration data are protected solely by checks performed on the client side rather than being enforced server-side. In secure software design, all authorization decisions must be made and validated by the trusted server component to ensure that requests cannot be manipulated before reaching the backend logic. By relying on client-side validation, the system fails to verify whether an unauthenticated user has legitimate privileges to access specific pages or retrieve configuration data, allowing attackers to bypass these checks entirely through direct HTTP request manipulation or browser console interaction.
From a technical perspective, this flaw represents a classic case of broken access control where the application assumes that hiding interface elements or disabling buttons on the client side is sufficient protection for backend resources. Attackers can exploit this by intercepting network traffic using tools such as Burp Suite or OWASP ZAP and modifying requests to target endpoints intended only for authenticated administrators. Since the server does not independently verify the session state or user permissions before processing these requests, it returns sensitive information regardless of the requester's authentication status. This allows unauthenticated remote attackers to access specific pages within the intercom system’s web interface that should be restricted, leading directly to the disclosure of partial system configuration values.
The operational impact of this vulnerability is significant for organizations deploying Kingdom Communication Associated video intercom systems in both residential and commercial environments. The exposure of partial system configuration values can reveal critical infrastructure details such as network settings, IP addresses, port configurations, or default credentials embedded within the configuration files. This information serves as valuable reconnaissance data for further attacks, potentially enabling privilege escalation, remote code execution, or denial-of-service conditions against the intercom device and any connected networks. Furthermore, because video intercom systems often integrate with broader building security infrastructures, compromising this component could provide an entry point into larger corporate or residential network segments, violating principles of defense in depth and network segmentation.
This vulnerability aligns closely with CWE-284 Improper Access Control, specifically the sub-category where access control decisions are made on the client side rather than the server side. It also maps to MITRE ATT&CK technique T1078 Valid Accounts if an attacker uses stolen credentials to bypass additional layers, but in this specific context of unauthenticated access, it reflects a failure in authentication enforcement that allows unauthorized data retrieval akin to CWE-200 Information Exposure. To mitigate this risk, developers must enforce all authorization checks on the server side, ensuring that every request is validated against user roles and permissions before any sensitive logic or data is processed. Implementing robust session management, using secure cookies with HttpOnly flags, and regularly auditing access control lists are essential steps to prevent such bypasses. Additionally, organizations should deploy web application firewalls to detect anomalous requests targeting administrative endpoints and conduct regular penetration testing to identify similar architectural flaws in IoT devices before deployment.