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Critical Vulnerabilities in Mitsubishi Electric Products Expose Industrial Systems to Risk

2 min readSource: INCIBE-CERT

Multiple high-severity flaws in Mitsubishi Electric products could allow remote code execution and DoS attacks. Patch immediately to secure OT environments.

Mitsubishi Electric Products Affected by Multiple Critical Vulnerabilities

Madrid, Spain – January 8, 2026 – Spain’s National Cybersecurity Institute (INCIBE) has issued an urgent advisory warning of multiple vulnerabilities in Mitsubishi Electric industrial automation products. These flaws, if exploited, could enable remote code execution (RCE), denial-of-service (DoS) attacks, and unauthorized access to operational technology (OT) systems.

Technical Details of the Vulnerabilities

The vulnerabilities affect several Mitsubishi Electric products, including:

  • GX Works3 (CVE-2026-XXXX, CVE-2026-XXXX)
  • MELSEC iQ-R Series (CVE-2026-XXXX)
  • MELSEC iQ-F Series (CVE-2026-XXXX)

Key technical details include:

  • CVE-2026-XXXX (CVSS 9.8): A buffer overflow vulnerability in GX Works3 could allow attackers to execute arbitrary code remotely without authentication.
  • CVE-2026-XXXX (CVSS 8.6): A improper input validation flaw in MELSEC iQ-R Series may lead to a DoS condition, disrupting industrial processes.
  • CVE-2026-XXXX (CVSS 7.5): An authentication bypass vulnerability in MELSEC iQ-F Series could permit unauthorized access to sensitive configurations.

The vulnerabilities stem from improper input validation, memory corruption, and weak authentication mechanisms in the affected software and firmware.

Impact Analysis

Exploitation of these vulnerabilities poses severe risks to industrial environments, including:

  • Operational Disruption: Successful DoS attacks could halt critical manufacturing or infrastructure processes.
  • Unauthorized Control: RCE flaws may allow attackers to manipulate industrial equipment, leading to safety hazards or production sabotage.
  • Data Theft: Authentication bypass vulnerabilities could expose sensitive OT configurations or proprietary industrial data.

Given the widespread use of Mitsubishi Electric products in sectors such as manufacturing, energy, and water treatment, these flaws could have cascading effects on supply chains and critical infrastructure.

Recommendations for Mitigation

INCIBE and Mitsubishi Electric urge organizations to take immediate action:

  1. Apply Patches: Update affected products to the latest firmware versions provided by Mitsubishi Electric. Patch links are available in the official advisory.
  2. Network Segmentation: Isolate OT systems from corporate networks and the internet to limit exposure.
  3. Monitor for Exploits: Deploy intrusion detection/prevention systems (IDS/IPS) to detect anomalous traffic targeting vulnerable devices.
  4. Least Privilege Access: Restrict user permissions to minimize potential damage from authentication bypass attacks.
  5. Incident Response Planning: Prepare for potential breaches by reviewing and updating OT-specific incident response protocols.

For full technical details and patch information, refer to the INCIBE advisory.

This is a developing story. Updates will be provided as more information becomes available.

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