Google Docs (HTML code) Multiple Cross Site Scripting Vulnerabilities I. Background: Google Docs is an online application which makes possibile to "Create and share your work online". You can use it to create Documents, Presentations, Spreadsheets and Forms. II. Description: Multiple cross site scripting vulnerabilities were identified in Google Docs. A remote attacker could write a malformed document and invite, through Google Docs sharing option, other users to see it in order to obtain their cookies. It's also possible to public this malformed document and send its link around the web. III. Details: Google Docs makes possible to create a new document. When a user creates a new document he has the possibility to change its html code through the Edit Html option. An attacker can make a malformed document using decimal HTML entities (without semicolons) and hexadecimal entities (with semicolons) to bypass antixss filters. Example:(decimal HTML entity)