Cross-site scripting (XSS) vulnerability on I-O DATA DEVICE WN-G300R devices with firmware 1.12 and earlier, WN-G300R2 devices with firmware 1.12 and earlier, and WN-G300R3 devices with firmware 1.01 and earlier allows remote authenticated users to inject arbitrary web script or HTML via unspecified vectors.
http://www.iodata.jp/support/information/2016/wn-g300r_xss/