Open-Xchange: OX (Guard): Stored Cross-Site Scripting via Email Attachment

Summary Improper handling of email attachments by "OX Guard" causes a Stored Cross-Site Scripting XSS vulnerability inside the OX "Mail" module. Injected code will be executed when the victim opens the HTML attachment of a decrypted email by using the "Open in browser" link/button. Proof of Conce...