How secure is the News app and RSS feeds?

I like the news app and I do add sites I think I can trust. But how secure is the news app and RSS feeds? How likely is my Nextcloud server to get attacked and hacked into if a RSS feed I subscribe to goes rouge? Is there anyway I could shield my server against possible nefarious RSS feeds? Seems to have some explanation on security measures in place. But I’m still a bit unsure. I’d like to see some more documentation on security provided.

Important security feature is adding credentials, a user name and password, to your private RSS feeds to prevent absolutely anyone with the URL from reading them. Example: Activity app allows useful RSS feeds in addition to emails, but does not yet support authentication for the RSS feed once enabled.