Final answer:
The correct answer is 'c' as manually approving wireless endpoints is a security measure, not a risk. Other options describe actual risks associated with an insecurely configured wireless router.
Step-by-step explanation:
The query about what is NOT a risk when a home wireless router is not securely configured involves understanding different security issues. Option 'c' Wireless endpoints must be manually approved to connect to the WLAN is the correct answer, as it describes a secure method to ensure only authorized devices connect to the router, not a risk of an insecure configuration.
An insecurely configured router can indeed facilitate malware injection into connected devices (option 'a'), interception and capture of sensitive information like usernames and passwords (option 'b'), and unauthorized access to data if file sharing is enabled without proper security (option 'd').