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Polish CHP Plant Sabotaged via Wind Farm Network in Coordinated Cyberattack

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On December 29, 2025, attackers disrupted a Polish combined heat and power (CHP) plant in a multi-stage cyberattack that began by breaching a wind farm's FortiGate firewall. The attackers tunnelled through a Teltonika cellular router into a power distributor's private APN, then used a WAGO PLC with default credentials to pivot into the CHP plant's operational technology network. Once inside, they forced Siemens PLCs into STOP mode, halted the steam turbine and process-water treatment systems, and factory-reset or bricked multiple Moxa and other industrial devices. CERT Polska, which published its follow-up analysis around August 10, 2026, identified this as the first confirmed case of lateral movement across organisations via a shared private APN. No definitive attribution has been made public for the incident.

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