Subnet Solutions PowerSYSTEM Center

Summary

CISA released an ICS advisory for Subnet Solutions PowerSYSTEM Center detailing CRLF injection vulnerabilities (CWE-93) affecting versions 5.8.x through 7.0.x. Successful exploitation by authenticated attackers could expose sensitive information or cause CRLF injection attacks. No public exploitation has been reported; Subnet Solutions recommends immediate updates to PSC 2020 Update 29, PSC 2024 Update 2, or PSC 2026 GA Hotfix.

Full text

ICS Advisory Subnet Solutions PowerSYSTEM Center Release DateMay 12, 2026 Alert CodeICSA-26-132-02 Related topics: Industrial Control System Vulnerabilities, Industrial Control Systems View CSAF 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) CVSS Vendor Equipment Vulnerabilities v3 8.2 Subnet Solutions Inc. Subnet Solutions PowerSYSTEM Center Incorrect Authorization, Improper Neutralization of CRLF Sequences ('CRLF Injection') Background Critical Infrastructure Sectors: Critical Manufacturing, Energy Countries/Areas Deployed: Worldwide Company Headquarters Location: Canada Vulnerabilities Expand All + CVE-2026-26289 PowerSYSTEM Center REST API endpoint for device account export allows an authenticated user with limited permissions to expose sensitive information normally restricted to administrative permissions only. View CVE Details Affected Products Subnet Solutions PowerSYSTEM Center Vendor:Subnet Solutions Inc. Product Version:Subnet Solutions Inc. PowerSYSTEM Center 2020: >=5.8.x|<=5.28.x, Subnet Solutions Inc. PowerSYSTEM Center 2024: >=6.0.x|<=6.1.x, Subnet Solutions Inc. PowerSYSTEM Center 2026: 7.0.x Product Status:known_affected Remediations MitigationSubnet Solutions recommends users update to the latest version of PowerSYSTEM Center PSC 2020 Update 29, PSC 2024 Update 2, and PSC 2026 GA Hotfix. MitigationFor assistance in upgrading, users should contact a Subnet Solutions System Integration team member or customer support team at (403) 270-8885 or by email at support@subnet.com.mailto:support@subnet.com MitigationSubnet Solutions recommends users do the following in order to reduce risk:Monitor user activity records to ensure users are following acceptable usage policies of the application.Restrict access to Notification Settings to trusted Administrators Monitor "Send from Address" in settings and Activity Records.Configure a notification rule that triggers in any bulk account export activity. Relevant CWE: CWE-863 Incorrect Authorization Metrics CVSS Version Base Score Base Severity Vector String 3.1 8.2 HIGH CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L CVE-2026-33570 PowerSYSTEM Center REST API endpoint for devices allows a low privilege authenticated user to access information normally limited by operational permissions. View CVE Details Affected Products Subnet Solutions PowerSYSTEM Center Vendor:Subnet Solutions Inc. Product Version:Subnet Solutions Inc. PowerSYSTEM Center 2020: >=5.11.x|<=5.28.x Product Status:known_affected Remediations MitigationSubnet Solutions recommends users update to the latest version of PowerSYSTEM Center PSC 2020 Update 29, PSC 2024 Update 2, and PSC 2026 GA Hotfix. MitigationFor assistance in upgrading, users should contact a Subnet Solutions System Integration team member or customer support team at (403) 270-8885 or by email at support@subnet.com.mailto:support@subnet.com MitigationSubnet Solutions recommends users do the following in order to reduce risk:Monitor user activity records to ensure users are following acceptable usage policies of the application.Restrict access to Notification Settings to trusted Administrators Monitor "Send from Address" in settings and Activity Records.Configure a notification rule that triggers in any bulk account export activity. Relevant CWE: CWE-863 Incorrect Authorization Metrics CVSS Version Base Score Base Severity Vector String 3.1 5.7 MEDIUM CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N CVE-2026-35555 PowerSYSTEM Center feature for device project groups allows an authenticated user with limited permissions to perform an unauthorized deletion of project groups. View CVE Details Affected Products Subnet Solutions PowerSYSTEM Center Vendor:Subnet Solutions Inc. Product Version:Subnet Solutions Inc. PowerSYSTEM Center 2024: >=6.0.x|<=6.1.x, Subnet Solutions Inc. PowerSYSTEM Center 2026: 7.0.x Product Status:known_affected Remediations MitigationSubnet Solutions recommends users update to the latest version of PowerSYSTEM Center PSC 2020 Update 29, PSC 2024 Update 2, and PSC 2026 GA Hotfix. MitigationFor assistance in upgrading, users should contact a Subnet Solutions System Integration team member or customer support team at (403) 270-8885 or by email at support@subnet.com.mailto:support@subnet.com MitigationSubnet Solutions recommends users do the following in order to reduce risk:Monitor user activity records to ensure users are following acceptable usage policies of the application.Restrict access to Notification Settings to trusted Administrators Monitor "Send from Address" in settings and Activity Records.Configure a notification rule that triggers in any bulk account export activity. Relevant CWE: CWE-863 Incorrect Authorization Metrics CVSS Version Base Score Base Severity Vector String 3.1 6.3 MEDIUM CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L CVE-2026-35504 PowerSYSTEM Center email notification service is affected by a CRLF injection vulnerability when using SMTPS communication. View CVE Details Affected Products Subnet Solutions PowerSYSTEM Center Vendor:Subnet Solutions Inc. Product Version:Subnet Solutions Inc. PowerSYSTEM Center 2020: <=5.28.x, Subnet Solutions Inc. PowerSYSTEM Center 2024: >=6.0.x|<=6.1.x, Subnet Solutions Inc. PowerSYSTEM Center 2026: 7.0.x Product Status:known_affected Remediations MitigationSubnet Solutions recommends users update to the latest version of PowerSYSTEM Center PSC 2020 Update 29, PSC 2024 Update 2, and PSC 2026 GA Hotfix. MitigationFor assistance in upgrading, users should contact a Subnet Solutions System Integration team member or customer support team at (403) 270-8885 or by email at support@subnet.com.mailto:support@subnet.com MitigationSubnet Solutions recommends users do the following in order to reduce risk:Monitor user activity records to ensure users are following acceptable usage policies of the application.Restrict access to Notification Settings to trusted Administrators Monitor "Send from Address" in settings and Activity Records.Configure a notification rule that triggers in any bulk account export activity. Relevant CWE: CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection') Metrics CVSS Version Base Score Base Severity Vector String 3.1 5.5 MEDIUM CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L 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 a

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