Cross-site scripting (XSS) vulnerability in the Web UI before 2.3.4 Build #85 for Tenable Nessus 5.x allows remote web servers to inject arbitrary web script or HTML via the server header.
Improper Neutralization of Input During Web Page Generation The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.