Your wireless network has been breached. It appears the attacker modified a portion of data used with the stream cipher and used this to expose wirelessly encrypted data. What is this attack called?

Initialization vectors are used with stream ciphers. An IV attack attempts to exploit a flaw to use the IV to expose encrypted data. Nothing in this scenario requires or describes a rogue access point/evil twin. Wi-Fi Protected Setup (WPS) uses a PIN to connect to the wireless access point (WAP). The WPS attack attempts to intercept that PIN in transmission, connect to the WAP, and then steal the WPA2 password.