CVE-2026-60134 in cMT3092X
Summary
by MITRE • 07/25/2026
Weintek cMT3092X HMI allows a non-privileged user to modify cookies to gain elevated privileges.
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Analysis
by VulDB Data Team • 07/25/2026
The Weintek cMT3092X HMI presents a critical privilege escalation vulnerability that stems from improper session management and inadequate access control mechanisms within its web-based interface. This device, commonly deployed in industrial control systems for human-machine interaction, fails to properly validate cookie modifications initiated by unauthenticated users, creating a pathway for malicious actors to elevate their privileges from standard user level to administrative access. The vulnerability exists due to the absence of robust session integrity checks and insufficient authorization controls that should prevent arbitrary cookie manipulation by unauthorized parties.
The technical flaw manifests in the HMI's web server implementation where session cookies are not adequately protected against modification or forging attempts. When a non-privileged user interacts with the system, the device generates authentication tokens that should remain immutable and tied to specific user contexts. However, the system's lack of proper cryptographic signing or validation mechanisms allows attackers to modify cookie values to impersonate administrators. This weakness directly aligns with CWE-285 which addresses improper authorization in authentication systems, and specifically relates to CWE-306 which covers missing authentication checks for critical functions.
From an operational perspective, this vulnerability poses significant risks to industrial environments as it enables attackers to gain unauthorized administrative access to critical control systems. An attacker could potentially modify production parameters, alter system configurations, or even cause operational disruptions by manipulating the HMI's interface settings. The impact extends beyond simple privilege escalation since many industrial control systems rely on HMI interfaces for critical process monitoring and control functions. This vulnerability can be exploited remotely without requiring physical access to the device, making it particularly dangerous in environments where network segmentation may not be properly implemented.
The exploitation of this vulnerability typically involves intercepting legitimate session cookies and modifying their contents to grant administrative privileges. Security practitioners should implement multiple layers of defense including network segmentation to isolate HMI devices from general network traffic, mandatory access controls that prevent cookie manipulation through proper authentication mechanisms, and regular security audits of industrial control system interfaces. Additionally, implementing secure session management practices such as using cryptographically secure tokens, implementing session timeout mechanisms, and deploying web application firewalls can significantly reduce the attack surface. Organizations should also consider following NIST SP 800-82 guidelines for industrial control systems security and align their mitigation strategies with MITRE ATT&CK framework techniques related to privilege escalation and credential access to properly address this class of vulnerabilities in industrial environments.