Invicti identified a misconfigured sandbox attribute in an iframe.

IFrame sandboxing enables a set of extra restrictions for the content in the inline frame.

Same Origin policy allows one window to access properties/functions of another one only if they come from the same protocol, the same port and the same domain.URLs from the same origin:http://site.comhttp://site.com/http://site.com/my/page.htmlURLs not from the same origin:http://www.site.com (sub domain)http://site.org (different domain)https://site.com (different protocol)http://site.com:8080 (different port)

When the sandbox attribute is set, the iframe content is treated as being from a unique origin, forms and scripts are disabled, links are prevented from targeting other browsing contexts and plugins are disabled.

When misconfigured sandbox attribute of an iframe on the same origin:

• Compromised website in the iframe might affect the users in parent web application.
• With a sandbox attribute containing both the allow-same-origin and allow-scripts flags, framed page can reach up into the parent and remove the sandbox attribute entirely.

• Avoid the usage of allow-same-origin and allow-scripts at the same time.