Pro-Russian hacktivists modify OT pump settings at five Polish water treatment facilities

Poland's Internal Security Agency (ABW) disclosed that pro-Russian hacktivist actors penetrated the operational technology (OT) networks of five water treatment facilities and modified pump control parameters. At least one facility activated manual override procedures to prevent potential service disruption; no compromise of drinking water quality or supply loss was confirmed. ABW attributed the activity to actors operating in support of Russian geopolitical objectives but stopped short of formal state attribution. The attack pattern — IT/OT flat network exploitation leading to HMI manipulation — is consistent with prior campaigns attributed to NoName057(16) and Cyber Army of Russia Reborn in Central and Eastern European infrastructure. Polish water sector authorities and critical-infrastructure operators have been placed on heightened alert. The ABW advisory is a single-source national CERT/authority disclosure.