CISA flags OpenPLC Runtime v3 XSS flaw enabling PLC hijack
CISA published an advisory for CVE-2026-88020, a medium-severity cross-site scripting flaw in Autonomy Logic's OpenPLC Runtime v3. Exploitation could let an attacker hijack session cookies and issue state-changing requests as an operator, controlling the programmable logic controller and the physical processes it drives. OpenPLC v3 is end-of-life; the vendor recommends upgrading to v4.
Sources and evidence
Attributed quotes
“Successful exploitation of this vulnerability could allow an attacker to hijack session cookies and issue state-changing requests as an operator which would allow the attacker to control the programmable logic controller and the physical processes it drives.”
“Autonomy Logic recommends users upgrade to OpenPLC v4 as OpenPLC v3 is end-of-life and is no longer receiving patches, bug fixes, or security updates.”
Summary last validated Sep 29, 2026
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