OpenPLC Security Vulnerability Has Been Identified
A critical flaw in OpenPLC Runtime v3 could allow unauthorized control of industrial physical processes.
Updated on Sept. 22, 2026 in Cybersecurity
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OpenPLC has issued a security advisory regarding a vulnerability in its Runtime v3 software. The flaw, tracked as CVE-2026-88020, poses risks to critical systems by allowing attackers to hijack session cookies.
Why it matters
The vulnerability allows an attacker to impersonate an operator and issue state-changing requests. This creates the potential for unauthorized access to and control of physical processes within sensitive infrastructure environments.
The vulnerability tracked as CVE-2026-88020 affects OpenPLC Runtime v3. This software is widely utilized across critical manufacturing, energy, water, and transportation sectors.
The players
OpenPLC
OpenPLC is an organization that provides open-source software solutions for programmable logic controllers used in industrial automation.
CISA
The Cybersecurity and Infrastructure Security Agency is a United States federal agency tasked with protecting national infrastructure from cyber threats.
The details
Attackers can exploit this security gap to hijack active session cookies from legitimate users. Once inside, they can issue commands as if they were an authorized operator, effectively gaining control over programmable logic controllers and the physical hardware they manage.
Timeline
September 22, 2026: CISA released the initial security advisory regarding the flaw.
The Tech Race
This vulnerability underscores the ongoing challenges in meeting the NERC Critical Infrastructure Protection standards for securing industrial digital assets. As industrial systems become increasingly connected, this development highlights the necessity of replacing legacy session management with more robust, secure authentication protocols.
Operators of critical systems should prioritize applying security updates to their OpenPLC Runtime v3 environments immediately. Failure to address this flaw could lead to unauthorized personnel gaining command over physical industrial processes.
The takeaway
Maintaining strict session management is essential for any facility relying on automated logic controllers. Regularly monitoring official security advisories is the most effective way to prevent unauthorized access to sensitive operational technology.
Further reading
Learn more about securing industrial networks in our Cybersecurity section.
Source note: This article includes information reported by Cisa.
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