The CISA advisory ICSA-26-204-03 has disclosed a critical set of vulnerabilities affecting the Weintek cMT3092X Human Machine Interface (HMI). Assigned CVE-2026-60134, this flaw specifically targets the device's web interface management. With a CVSS v3 score of 8.8, this issue poses a severe risk to Critical Manufacturing sectors worldwide. Successful exploitation allows a non-privileged user to escalate privileges to administrative levels or view credentials of other users in plaintext. Given the role of HMIs as the bridge between OT and IT networks, a compromise here serves as a prime pivot point for ransomware or lateral movement into the industrial control system (ICS). Defenders must act immediately to identify affected assets and enforce strict network segmentation.
Technical Analysis
Affected Products:
- Device: Weintek cMT3092X HMI.
- Vulnerable Firmware: Versions prior to 20210218.
- Vulnerable Software: EasyWeb versions prior to v2.1.20.
Vulnerability Details: The core issue is identified as CWE-565: Reliance on Cookies without Validation and Integrity Checking in a Security Decision.
- Mechanism: The EasyWeb server on the cMT3092X utilizes session cookies to determine user privileges. The application fails to cryptographically sign or validate the integrity of these cookies on the server side.
- Attack Chain: An attacker with basic access to the network (perhaps via a compromised workstation on the OT VLAN) can authenticate as a low-privilege user. Once authenticated, they intercept their session cookie and modify the fields corresponding to privilege levels (e.g., changing
user_level=1touser_level=9). Replaying this modified cookie grants administrative access to the web interface. - Additional Flaws: The advisory also notes CWE-256: Plaintext Storage of a Password and Incorrect User Management, implying that once administrative access is gained via the cookie flaw, an attacker can dump other user credentials due to insecure storage practices, facilitating further persistence.
Exploitation Status: While specific in-the-wild exploitation has not been confirmed in this advisory, the simplicity of the attack (client-side cookie modification) lowers the barrier for entry significantly. CISA inclusion highlights the critical nature of this asset in national infrastructure.
Detection & Response
SIGMA Rules
---
title: Potential Privilege Escalation on Weintek HMI Web Interface
id: 8a1b2c3d-4e5f-6a7b-8c9d-0e1f2a3b4c5d
status: experimental
description: Detects potential web requests attempting to access administrative paths or configuration pages on Weintek EasyWeb interfaces, indicative of successful privilege escalation or reconnaissance.
references:
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-204-03
author: Security Arsenal
date: 2026/07/22
tags:
- attack.initial_access
- attack.privilege_escalation
- ics
logsource:
category: proxy
product: suricata
detection:
selection:
c-uri|contains:
- '/admin'
- '/config'
- '/userconfig'
- '/sys_config.php'
condition: selection
falsepositives:
- Legitimate administrative maintenance by authorized engineers
level: high
---
title: Web Access to Weintek cMT3092X EasyWeb Interface
id: 9d2e3f4a-5b6c-7d8e-9f0a-1b2c3d4e5f6a
status: experimental
description: Identifies traffic directed towards known Weintek HMI web interfaces to track access patterns and potential brute-forcing or cookie manipulation attempts.
references:
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-204-03
author: Security Arsenal
date: 2026/07/22
tags:
- attack.reconnaissance
- ics
logsource:
category: webserver
product: easyweb
detection:
selection:\ cs-host|contains:
- 'cMT3092X'
c-uri|contains:
- '/index.html'
- '/login'
filter_legit:
SrcIp|startswith:
- '10.'
- '192.168.'
condition: selection | not filter_legit
falsepositives:
- Authorized access from internal engineering subnets
level: medium
KQL (Microsoft Sentinel / Defender)
// Hunt for administrative access or configuration changes on Weintek HMIs
let WeintekHMI = "cMT3092X";
DeviceNetworkEvents
| where RemotePort in (80, 443, 8080)
| where RemoteUrl has_any ("admin", "config", "user")
| where DeviceName contains WeintekHMI or InitiatingProcessCommandLine contains WeintekHMI
| project Timestamp, DeviceName, InitiatingProcessAccountName, RemoteUrl, RemoteIP
| order by Timestamp desc
Velociraptor VQL
-- Hunt for active network connections to Weintek HMI default web ports
SELECT Fqdn, Pid, Name, UserName, RemoteAddress, RemotePort, State
FROM listen_sockets()
WHERE Port IN (80, 443, 8080)
AND Protocol = 'tcp'
-- Check for specific process names if Weintek service runs on Windows Jump Hosts
OR Name =~ 'EasyWeb'
Remediation Script
#!/bin/bash
# Network Discovery Script for Weintek cMT3092X Vulnerability (CVE-2026-60134)
# This script scans a defined subnet for Weintek HMIs and checks the HTTP Server header for version indicators.
TARGET_SUBNET="192.168.1.0/24" # Replace with your OT subnet
PORT=80
echo "[*] Scanning $TARGET_SUBNET for Weintek HMI devices on port $PORT..."
# Using nmap to scan for web servers and grab http-server-header
# Note: Adjust nmap path based on your distro
if command -v nmap &> /dev/null; then
nmap -p $PORT --open -sV --script http-server-header $TARGET_SUBNET 2>/dev/null | grep -B 4 "Weintek"
else
echo "[!] Nmap not found. Please install nmap to run this scan."
fi
echo "[*] Manual Verification Required:"
echo " 1. Access the web interface of identified devices."
echo " 2. Navigate to System Settings -> Firmware Info."
echo " 3. If Firmware is < 20210218, the device is VULNERABLE."
echo " 4. If EasyWeb version is < v2.1.20, the device is VULNERABLE."
Remediation
To mitigate the risks associated with CVE-2026-60134 and the associated CWEs, apply the following controls immediately:
- Patch Firmware: Update the Weintek cMT3092X firmware to version 20210218 or later.
- Update Software: Update the EasyWeb component to version v2.1.20 or later.
- Source: Weintek Official Download Center
- Network Segmentation: Ensure HMIs are placed in a dedicated VLAN with strict firewall rules. Only allow necessary management traffic (TCP 80/443) from trusted engineering workstations, blocking general access from the IT network.
- Disable Unused Services: If the web interface (EasyWeb) is not required for operations, disable it entirely to reduce the attack surface.
- Review User Accounts: Audit the HMI for unauthorized user accounts. Due to the plaintext storage vulnerability, assume all credentials on the device may be compromised and reset them post-patch.
- CISA Advisory: Review the full details at CISA ICSA-26-204-03.
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