YES!

We strongly recommend setting up your system's Wi-Fi network with the strongest available security measures.

At the time of this writing, we recommend the WPA2 security protocol.

Newer routers/wireless access points may support the more advanced WPA3 protocol. If upgrading your home network, contact your security professional for more information. 

Unsecured networks can expose your remote services login, password and video feeds to unscrupulous persons in addition to endangering other sensitive data.

Secure Wi-Fi networks are indicated by a lock icon as seen here on iOS (left) and Android (right) Settings screens:
If you don't see the lock icon next to the Wi-Fi symbol, that network is NOT secured.