Critical Session Hijacking Risk in OpenPLC Runtime v3

Technical Impact Analysis

Security researchers have discovered an 'Improper Neutralization of Input During Web Page Generation' vulnerability within OpenPLC Runtime v3 (CVE-2026-88020). This flaw allows an adversary to perform session hijacking by capturing cookies, enabling them to masquerade as an authenticated operator. The impact is severe, as the attacker can send state-changing requests to the programmable logic controller (PLC). Consequently, unauthorized parties could manipulate the physical processes controlled by these units, posing substantial safety and operational risks.

Operational Safeguards

Securing operational technology (OT) is paramount when dealing with vulnerabilities that affect physical infrastructure. We recommend the following steps:

• Immediate Patching: Users of OpenPLC Runtime v3 should consult the latest vendor guidance to apply security updates that address input sanitization issues.
• Restrict Access: Limit access to the web management interface of PLC devices to trusted, internal IP addresses only using VPN or secure gateway solutions.
• Monitoring: Implement strict monitoring on network traffic originating from or directed toward PLC devices to detect anomalous state-changing requests.
• Principle of Least Privilege: Ensure that the user sessions connecting to these devices are temporary and strictly monitored.

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แหล่งที่มา: CISA Cybersecurity Advisories เผยแพร่ครั้งแรก: Tue, 22 Sep 26 12:00:00 +0000 บทความต้นฉบับ: อ่านต้นฉบับ