A vulnerability has been found in Subnet Solutions PowerSYSTEM Center 2020, PowerSYSTEM Center 2024 and PowerSYSTEM Center 2026 up to 5.28.x and classified as problematic . This affects an unknown function of the component REST API Endpoint . This manipulation causes incorrect authorization. This vulnerability is registered as CVE-2026-26289 . The attack requires access to the local network. No exploit is available.