I have unregistered people trying to access the shoutbox which is only available to certain usergroups. You can see in the screenshot that they are trying to access a specific area. Is this a security risk?
Bots do this all the time, they hit sites/scripts with potential URIs that cause SQL injection or grant access to a file and send the info back elsewhere. You can think of them as spiders except they won't follow your robots.txt file