CVE-2026-79391 in Trueview
Summary
by MITRE • 09/04/2026
No authentication exists in the MQTT service of Trueview 6.0.23.4. The MQTT broker accepts client connections on TCP port 1883 without requiring authentication, allowing a remote attacker with network access to establish an MQTT session and perform unauthorized publish or subscribe operations.
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Analysis
by VulDB Data Team • 09/04/2026
The vulnerability identified in the MQTT service of Trueview version 6.0.23.4 represents a critical failure in identity verification mechanisms within Internet of Things infrastructure. The Message Queuing Telemetry Transport protocol is widely utilized for lightweight communication between devices and servers, particularly in environments where bandwidth and power consumption are constrained. In this specific implementation, the MQTT broker configured on TCP port 1883 operates without enforcing any form of authentication upon connection establishment. This configuration deviation means that the service does not validate credentials such as usernames or passwords before allowing a client to interact with the broker. Consequently, any entity capable of reaching the network segment hosting the Trueview device can initiate a session and exert control over data flows without providing proof of identity.
From a technical perspective, this flaw constitutes an absence of access control at the application layer. The MQTT protocol specification includes optional authentication fields within its CONNECT packet structure, which are designed to be verified by the broker before granting permissions for PUBLISH or SUBSCRIBE operations. In this vulnerable scenario, these checks are either disabled entirely or bypassed due to misconfiguration. This allows a remote attacker with basic network connectivity to exploit the open port and engage in unauthorized data manipulation. The lack of authentication removes the fundamental barrier that prevents untrusted actors from injecting malicious telemetry data, reading sensitive operational metrics, or disrupting service availability by flooding topics with excessive messages.
The operational impact of this vulnerability is severe, particularly for systems relying on Trueview for critical monitoring or control functions. An attacker can subscribe to existing topics to eavesdrop on private communications between devices and the central management system, leading to a significant compromise of confidentiality. Furthermore, the ability to publish unauthorized messages enables data integrity violations where false sensor readings or commands can be injected into the system. This could trigger incorrect automated responses, such as activating alarms falsely or disabling safety mechanisms. In industrial control systems or smart home environments, this level of access could lead to physical consequences, including equipment damage or safety hazards, depending on what specific devices are connected to the MQTT broker.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-287, which describes Improper Authentication, as well as CWE-306 regarding Missing Authentication for Critical Function. The exploitation technique corresponds to MITRE ATT&CK tactic T1078 Valid Accounts if credentials were known but misused, or more accurately T1595 Active Scanning when combined with network discovery, and specifically relates to unauthorized access patterns often seen in IoT botnet recruitment where unsecured brokers are targeted for command-and-control infrastructure. The absence of authentication effectively turns the MQTT broker into an open relay that can be abused by malicious actors without detection or prevention mechanisms at the protocol level.
Mitigation strategies must prioritize immediate remediation through configuration hardening and network segmentation. The primary corrective action is to enforce strong authentication on the MQTT broker, ensuring that all client connections require valid credentials before any operations are permitted. This involves updating the Trueview software to a patched version if available or manually configuring the broker settings to enable username-password verification or certificate-based mutual TLS authentication. Additionally, implementing Transport Layer Security encryption ensures data confidentiality and integrity during transit, preventing eavesdropping even if access controls were initially bypassed. Network-level defenses such as firewalls should be configured to restrict access to port 1883 exclusively from trusted IP addresses or subnets, thereby limiting the attack surface for remote exploitation. Regular security audits of IoT device configurations are essential to prevent similar misconfigurations in future deployments.