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  • OpenPLC Runtime v3

    From Cisa Advisories@2:263/1 to All on Tue Sep 22 17:03:06 2026
    OpenPLC Runtime v3

    View CSAF
    Summary
    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.
    The following versions of OpenPLC Runtime v3 are affected:

    OpenPLC 3 (CVE-2026-88020)





    CVSS
    Vendor
    Equipment
    Vulnerabilities




    v3 6.1
    Autonomy Logic
    OpenPLC Runtime v3
    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')




    Background

    Critical Infrastructure Sectors: Critical Manufacturing, Energy, Transportation Systems, Water and Wastewater Systems Countries/Areas Deployed: Worldwide Company Headquarters Location: United States


    Vulnerabilities

    Expand All +

    CVE-2026-88020

    The affected product is susceptible to an improper neutralization of input during web page generation vulnerability when the web interface attempts to route the program based on a query string parameter with no encoding. View CVE Details

    Affected Products
    OpenPLC Runtime v3

    Vendor:Autonomy Logic
    Product Version:Autonomy Logic OpenPLC: 3 Product Status:known_affected


    Remediations
    Vendor fixAutonomy 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.

    Relevant CWE: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

    Metrics




    CVSS Version
    Base Score
    Base Severity
    Vector String




    3.1
    6.1
    MEDIUM
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N


    4.0
    5.3
    MEDIUM
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N








    Acknowledgments

    Rajivarnan R. and Shirshak of Secnora reported this vulnerability to CISA.


    Legal Notice and Terms of Use
    This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).

    Recommended Practices
    CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability.

    Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolating them from business networks. When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.

    CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA also provides a section for control systems security recommended practices
    on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
    CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets. Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
    Strategies.
    Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
    CISA also recommends users take the following measures to protect themselves from social engineering attacks:

    Do not click web links or open attachments in unsolicited email messages. Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
    Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.

    No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.

    Revision History

    Initial Release Date: 2026-09-22




    Date
    Revision
    Summary




    2026-09-22
    1
    Initial Publication




    Legal Notice and Terms of Use

    https://www.cisa.gov/news-events/ics-advisories/icsa-26-265-09

    2026-09-22 12:00 UTC

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    * Origin: LISTS. from TCOB1 READ ONLY (2:263/1)