CVE-2026-104075 in Receiver
Summary
by MITRE • 10/08/2026
TVU Networks Receiver/Transceiver devices running firmware before version 7.9 contain an authentication bypass vulnerability in the web management login endpoint POST /tvu/Login that allows remote unauthenticated attackers to obtain an administrative session by submitting an empty or absent UserName parameter. Attackers can send a crafted HTTP request directly, bypassing client-side JavaScript validation, to receive a valid session cookie regardless of the password value and gain full administrative control of the device's web management interface.
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Analysis
by VulDB Data Team • 10/08/2026
The vulnerability identified in TVU Networks Receiver/Transceiver devices operating on firmware versions prior to 7.9 represents a critical authentication bypass flaw within the web-based management interface. This security defect is located specifically at the POST /tvu/Login endpoint, which serves as the primary mechanism for user authentication and session initialization. The core technical issue stems from insufficient server-side validation of credentials during the login process. Specifically, the application logic fails to enforce mandatory requirements for the UserName parameter when processing authentication requests. Consequently, an attacker can manipulate this input field by submitting either an empty string or omitting the parameter entirely in the HTTP request payload. This oversight allows the system to generate a valid administrative session cookie without requiring any knowledge of the actual administrator password, effectively rendering traditional credential-based security controls obsolete for this specific endpoint.
From a technical perspective, the exploitation of this vulnerability relies on bypassing client-side JavaScript validation mechanisms that are typically employed to prevent malformed requests from reaching the server. While these frontend checks may provide some usability benefits or basic input sanitization, they offer no cryptographic assurance and can be trivially circumvented by sending crafted HTTP requests directly using standard networking tools such as curl or Python scripts with libraries like urllib3 or requests. By constructing a POST request to /tvu/Login with an empty UserName field, the server incorrectly interprets this as a valid authentication attempt for a default or privileged account state. The result is the issuance of a session token that grants full administrative privileges over the device's web management interface. This behavior indicates a fundamental failure in implementing secure design principles where trust boundaries are not properly enforced at the backend service layer, allowing unauthenticated actors to escalate their access level from none to administrator with minimal effort and no prior knowledge of system credentials.
The operational impact of this vulnerability is severe due to the nature of TVU Networks devices, which are often deployed in critical broadcasting infrastructure, live production environments, and remote field operations where reliable connectivity and control are paramount. An attacker who successfully exploits this flaw gains complete administrative access to the device's configuration settings. This level of access allows for comprehensive manipulation of network parameters, including IP addresses, routing tables, and firewall rules, which can lead to service disruption or unauthorized interception of video streams. Furthermore, an authenticated administrator session typically provides a foothold for further lateral movement within the local network segment where the transceiver resides. Attackers could potentially pivot from this compromised device to other critical systems by exploiting trust relationships between devices on the same subnet. In high-stakes broadcasting scenarios, such compromise could lead to significant financial loss, reputational damage, and potential national security implications if sensitive broadcast feeds are intercepted or manipulated during live transmission events.
This vulnerability aligns with several established industry standards for classifying software weaknesses. It is primarily categorized under CWE-287: Improper Authentication, as the system fails to adequately verify the identity of a user attempting to gain access. Additionally, it falls under CWE-306: Missing Authentication for Critical Function, because the critical function of establishing an administrative session does not require valid credentials when specific input parameters are manipulated. In terms of offensive security tactics, this exploitation technique maps directly to MITRE ATT&CK tactic T1078: Valid Accounts and specifically sub-technique T1078.3: Default Accounts if the system defaults to a known state for empty inputs, or more broadly to initial access vectors that involve exploiting misconfigured authentication mechanisms. The ability to bypass client-side checks also relates to CWE-602: Client-Side Enforcement of Server-Side Security, highlighting the danger of relying on frontend logic for security decisions.
To mitigate this vulnerability and secure TVU Networks Receiver/Transceiver devices against exploitation, immediate action is required at both the technical and operational levels. The most effective remediation strategy is to upgrade the device firmware to version 7.9 or later, where the vendor has addressed the authentication bypass flaw by implementing robust server-side validation that strictly enforces non-empty UserName parameters and validates credentials against a secure backend database regardless of input format. Until an update can be applied in environments with strict uptime requirements, network-level controls should be implemented as compensating measures. This includes restricting access to the web management interface via firewall rules or VLAN segmentation so that only trusted administrative IP addresses can reach the device's HTTP/HTTPS ports. Additionally, enabling multi-factor authentication if supported by newer firmware versions and disabling unused services on the device will reduce the attack surface. Regular security audits and penetration testing of broadcast infrastructure should be conducted to identify similar misconfigurations in other networked devices within the production environment.