KSeF
February 1, 2026
•[ DDoS attack, service disruption, e-invoicing ]
Polish reporting quoted Finance and Economy Minister Andrzej Domaski stating that early access problems with the KSeF e-invoicing system were due in part to a DDoS attack against the login system, alongside heavy legitimate login attempts. The minister said the DDoS traffic came from 17 countries, which contributed to overload and user access difficulties, and that the situation was brought under control. The reporting does not describe data theft; the primary effect is temporary disruption/degradation of system accessibility due to external traffic flooding.
