Cross-site request forgery (CSRF) vulnerability on I-O DATA DEVICE HVL-A2.0 HVL-A3.0 HVL-A4.0 HVL-AT1.0S HVL-AT2.0 HVL-AT3.0 HVL-AT4.0 HVL-AT2.0A HVL-AT3.0A and HVL-AT4.0A devices with firmware before 2.04 allows remote attackers to hijack the authentication of arbitrary users for requests that delete content.