Thanks for posting in the Apple Support Communities oliveoil82,
We wouldn't expect a light showing on your iPhone to be any indication of a security concerns.
If you're concerned about the security of your device, make sure you have the latest updates installed: Update your iPhone or iPad
You can learn more about how the security built into Apple devices and services, here: Apple Platform Security
That being said, are you seeing this light with your naked eye? Or is it being observed through a camera?
Providing more information and context about what you're encountering, can increase the chances that you'll get a response from the community with steps or guidance specific to the issue that offer a solution.
Cheers!