Hackers steal data of 2.4 million dental patients, demand 100,000 zloty

In September 2026, hacker group Horus attacked the FELG Dent system, software used by dental clinics in Poland, exploiting an IDOR security flaw. The criminals obtained personal and medical data of up to 2.4 million patients and are demanding 100 thousand zloty for not disclosing the information. This is another serious leak of Polish medical data in recent weeks.