The document discusses vulnerabilities in Web 2.0 technologies. It defines Web 2.0 and describes key characteristics like user-generated content, participation, and syndication of content. Common vulnerabilities like cross-site scripting and cross-site request forgery are explained. These issues are worse in Web 2.0 due to its dynamic nature, more places for untrusted user input, and ability to circumvent same-origin policies. Specific examples of exploiting these vulnerabilities in Web 2.0 apps and protocols like JSON are provided.