CVE-2026-39431 in EagleEye Cube USB
Summary
by MITRE • 11/04/2026
On HP Poly EagleEye Cube USB 1.3.1-001267 devices, one of the API functions available on a management service accessible via USB allows command injection. This allows attackers (without administrator-level access) to execute arbitrary commands on the device as root. This is due to insufficient input validation that allows an attacker to control part of the CSR certificate generation process. This provides full root access that permits full control over device operations, unauthorized access to data, and the ability to place a persistent backdoor on the device (which could operate via the Ethernet port).
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Analysis
by VulDB Data Team • 11/04/2026
The vulnerability identified in HP Poly EagleEye Cube USB devices running firmware version 1.3.1-001267 represents a critical security flaw within the local management service accessible through the Universal Serial Bus interface. This specific API function, which is intended to facilitate administrative tasks such as certificate generation or device configuration, suffers from insufficient input validation mechanisms. The core technical deficiency lies in the application's failure to properly sanitize user-supplied data before processing it for cryptographic operations. Specifically, when an attacker interacts with this endpoint via a connected USB peripheral, they can inject malicious payloads into fields that are subsequently passed to system-level commands responsible for generating Certificate Signing Requests (CSR). Because the input is not rigorously filtered against command injection patterns, special characters and shell metacharacters provided by the attacker are interpreted directly by the underlying operating system's command interpreter rather than being treated as literal data.
This lack of sanitization allows an unauthenticated or non-privileged user to achieve arbitrary code execution with root privileges on the target device. The operational impact is severe, as gaining root access effectively compromises the entire security posture of the video conferencing endpoint. An attacker can execute any command available in the system environment, leading to complete control over device operations. This includes the ability to modify system configurations, intercept network traffic, and exfiltrate sensitive data stored on or processed by the device. Furthermore, because the vulnerability allows for persistent modifications, an adversary could install a backdoor that remains active even after reboots. This persistence mechanism ensures long-term unauthorized access, potentially allowing the attacker to maintain control over the device through alternative interfaces such as the Ethernet port if network connectivity is established.
From a classification perspective, this flaw aligns with CWE-78 Improper Neutralization of Special Elements used in an OS Command and CWE-20 Improvement of Input Validation. The exploitation technique mirrors aspects of ATT&CK T1059 Command and Scripting Interpreter, where the attacker leverages system utilities to execute malicious commands. Additionally, the ability to install a persistent backdoor relates to ATT&CK techniques concerning persistence mechanisms such as T1547 Boot or Logon Autostart Execution or T1505 Server Software Component. The severity is exacerbated by the fact that USB interfaces are often physically accessible in meeting rooms and office environments, lowering the barrier for local physical attacks compared to remote network-based exploits.
Mitigation strategies must prioritize immediate firmware updates provided by HP Poly to patch this input validation deficiency. Until patches are applied, organizations should restrict physical access to these devices to authorized personnel only and disable any unnecessary USB management interfaces if supported by configuration options. Network segmentation can also help limit the blast radius in case of a compromise, ensuring that even if root access is gained via USB, lateral movement across the corporate network is hindered. Regular auditing of device configurations and monitoring for unusual outbound connections from these endpoints are recommended to detect potential backdoor installations or data exfiltration attempts early.