Unknown 19-year-old used a self-propagating worm that exploits a scripting vulnerability common to most dynamic Web sites. Technique could be used to destroy Web site data or steal private information. Attack depended on a long-known but little-protected vulnerability called cross-site scripting (XSS) XSS arises because many Web sites are dynamic, allowing users to manipulate Web site source code. Web sites and Web browsers such as Internet Explorer and Firefox try to block such XSS holes.”]
Source: https://www.csoonline.com/article/2119431/teen-uses-worm-to-boost-ratings-on-myspace-com.html