Yes; Cutenews is known for its annoying spam bots. If you're lucky, you don't get them (like me), but my current cutenews is from a 3rd installation or so. Like Kevinkatalyst said, CAPCHA is the answer. You can find how to install captcha somewhere on the CutePHP forums, just search Google or something. There's also an antispam tutorial located on daintystar -
http://daintystar.com/learn_cnantispam.php and I'm sure there's tons more out there. If you see someone with capcha on their Cutenews, ask them how they did it. Otherwise, switch to Wordpress!