CVE-2026-82930 in mH-DEVELOPER
Summary
by MITRE • 09/28/2026
mH-DEVELOPER smart home module does not verify tokens in its authorization middleware, leaving all HTTP API and WebSocket endpoints accessible without authentication. An unauthenticated attacker on the LAN can query these endpoints, access system information, and send raw control commands to manipulate building automation devices. This issue was fixed in version 3.0.30
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Analysis
by VulDB Data Team • 09/28/2026
The mH-DEVELOPER smart home module contains a critical authorization bypass vulnerability stemming from a failure to validate authentication tokens within its middleware layer. This architectural flaw effectively disables access control for all HTTP API and WebSocket endpoints exposed by the device, rendering them publicly accessible without any form of credential verification or session management checks. The absence of token validation means that the system does not enforce identity assertions before processing incoming requests, allowing any client to interact with internal services as if they were an authorized administrator or user. This represents a fundamental breakdown in security architecture where trust is assumed rather than verified at every interaction point.
From a technical perspective, this vulnerability aligns closely with CWE-287 Improper Authentication and CWE-306 Missing Authentication for Critical Function. The middleware component acts as the gatekeeper for incoming traffic but fails to inspect or validate the presence of valid security tokens in request headers or parameters. Consequently, an attacker can bypass authentication mechanisms entirely by simply omitting credentials or sending malformed requests that do not trigger validation errors due to the lack of enforcement logic. This type of flaw is particularly dangerous because it often goes undetected during standard penetration testing if testers assume default configurations include basic security controls.
The operational impact of this vulnerability is severe, as it grants an unauthenticated attacker on the local area network full control over building automation devices connected through the module. By querying exposed endpoints, an adversary can extract sensitive system information such as device states, configuration details, and potentially user data stored locally or referenced by the API. More critically, the ability to send raw control commands allows for direct manipulation of physical infrastructure including lighting, HVAC systems, locks, and other IoT devices. This capability transforms a digital vulnerability into tangible physical risks, enabling actions like unauthorized entry via smart locks, disruption of environmental controls, or creation of hazardous conditions within managed spaces.
This scenario is consistent with MITRE ATT&CK technique T1078 Valid Accounts when considering the exploitation context where valid credentials are not required due to system misconfiguration rather than credential theft. It also relates to T1526 Cloud Service Discovery if the module interacts with cloud services, though in this LAN-based context it primarily facilitates lateral movement and direct device control. The lack of authentication means that any entity on the same network segment can exploit these endpoints without detection by standard intrusion prevention systems that rely on identifying malicious payloads rather than unauthorized access patterns.
Mitigation for this vulnerability requires immediate implementation of robust token validation logic within the middleware layer to ensure every request is authenticated before processing. Developers must enforce strict adherence to security standards such as OAuth 2.0 or JWT best practices, ensuring tokens are verified against a trusted issuer and checked for expiration and integrity. Additionally, implementing rate limiting and input sanitization can help mitigate potential abuse of these endpoints even after authentication is restored. Organizations should upgrade the mH-DEVELOPER module to version 3.0.30 where this issue has been resolved. Until patching occurs, network segmentation strategies such as VLAN isolation or firewall rules restricting access to only trusted management subnets are recommended to limit exposure to unauthenticated attackers on the broader LAN.