An issue was discovered on D-Link 6600-AP and DWL-3600AP Ax 4.2.0.14 21/03/2019 devices. There is post-authenticated dump of all of the config files through a certain admin.cgi?action= insecure HTTP request.
https://www.dlink.com/en/security-bulletin
https://us.dlink.com/en/security-advisory
http://packetstormsecurity.com/files/153840/D-Link-6600-AP-XSS-DoS-Information-Disclosure.html