Toshiba Home gateway HEM-GW16A 1.2.9 and earlier, Toshiba Home gateway HEM-GW26A 1.2.9 and earlier uses hard-coded credentials, which may allow an attacker on the same network segment to login to the administrators settings screen and change the configuration or execute arbitrary OS commands.
https://jvn.jp/en/jp/JVN99810718/index.html
http://www.tlt.co.jp/tlt/information/seihin/notice/defect/20181219/20181219.htm