Multiple cross-site scripting (XSS) vulnerabilities in the commenting system in Review Board before 1.5.7 and 1.6.x before 1.6.3 allow remote attackers to inject arbitrary web script or HTML via vectors involving the (1) diff viewer or (2) screenshot component.
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.