U
Unauthorized Access
When a person gains access to information, devices or restricted locations without having permission, or the proper credentials.
Unauthorized Disclosure
When any type of sensitive or private information is released to the public or any person(s) not authorized to see the information.
URL injection
The act of inserting malicious code into a website. The code could be used to redirect the site to an alternate, potentially malicious, website. The code could also be used to force the webserver hosting the site to participate in a denialofservice attack, or to create new pages on the site that could contain malicious links or spam words.