CVE-2026-61892 in cMT3092X
Summary
by MITRE • 07/25/2026
Weintek cMT3092X HMI allows a non-privileged user to modify tokens to escalate privileges.
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Analysis
by VulDB Data Team • 07/25/2026
The Weintek cMT3092X Human Machine Interface (HMI) represents a critical security vulnerability where non-privileged users can manipulate authentication tokens to achieve privilege escalation. This flaw resides in the device's authentication mechanism and token management system, allowing unauthorized individuals to modify session tokens or authentication credentials without proper authorization. The vulnerability stems from insufficient validation of token integrity and lack of proper access controls during token modification processes.
This security weakness operates through a fundamental flaw in the HMI's authentication architecture where the system fails to adequately verify the authenticity of modified tokens before granting elevated privileges. When a user attempts to modify tokens, the system does not perform sufficient cryptographic verification or access control checks to ensure that the modification is authorized. The vulnerability can be exploited by attackers who gain initial access through legitimate means, then manipulate token values to assume administrative or higher-privileged roles within the HMI environment.
The operational impact of this vulnerability extends beyond simple privilege escalation as it compromises the entire security posture of industrial control systems relying on Weintek cMT3092X devices. An attacker with basic user credentials could potentially gain full administrative access to critical manufacturing processes, system configurations, and operational data. This scenario creates significant risks for industrial environments where HMI systems control production lines, safety mechanisms, and process automation. The vulnerability directly affects the CIA triad by compromising confidentiality through unauthorized data access, integrity through potential malicious modifications, and availability through possible system disruption.
The technical flaw aligns with CWE-287 which addresses improper authentication issues and represents a classic case of privilege escalation through token manipulation. This vulnerability also maps to ATT&CK technique T1078 which covers valid accounts and T1548.001 which covers abuse of privileges. The attack vector typically involves an initial compromise followed by token modification, often leveraging weak session management or predictable token generation algorithms.
Mitigation strategies should include implementing robust token validation mechanisms that verify cryptographic signatures before accepting any token modifications. Network segmentation and access control lists should be deployed to limit direct access to HMI systems from unauthorized networks. Regular security updates and firmware patches from Weintek should be applied immediately upon availability, while network monitoring solutions should detect unusual token modification patterns. Additionally, implementing multi-factor authentication mechanisms and regular privilege audits can significantly reduce the risk of exploitation. Organizations should also consider deploying intrusion detection systems specifically configured to monitor for token manipulation activities within their industrial control networks.