Subnet Solutions PowerSYSTEM Center

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Summary

Successful exploitation of these vulnerabilities could allow an authenticated attacker to expose sensitive information or cause a CRLF injection.

The following versions of Subnet Solutions PowerSYSTEM Center are affected:

• PowerSYSTEM Center 2020 <=5.28.x (CVE-2026-35504)
• PowerSYSTEM Center 2020 >=5.8.x|<=5.28.x (CVE-2026-26289)
• PowerSYSTEM Center 2020 >=5.11.x|<=5.28.x (CVE-2026-33570)
• PowerSYSTEM Center 2024 >=6.0.x|<=6.1.x (CVE-2026-26289, CVE-2026-35555, CVE-2026-35504)
• PowerSYSTEM Center 2026 7.0.x (CVE-2026-26289, CVE-2026-35555, CVE-2026-35504)

Background

• Critical Infrastructure Sectors: Critical Manufacturing, Energy
• Countries/Areas Deployed: Worldwide
• Company Headquarters Location: Canada

Vulnerabilities

Acknowledgments

• Kelly Stich of Subnet Solutions Inc reported these vulnerabilities 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 these vulnerabilities.

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 these vulnerabilities has been reported to CISA at this time. These vulnerabilities are not exploitable remotely.

Revision History

• Initial Release Date: 2026-05-12

Legal Notice and Terms of Use

• May 12, 2026
• CISA – Cybersecurity Advisories
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