We do not allow redirection outside the app, unless there is a bug.
Did you check this?

On Aug 25, 10:59 am, Eric Enns <ee...@seccuris.com> wrote:
> Hey,
>
> I know this has been discussed before, but this issued is now in the OWASP 
> top ten web application 
> vulnerabilitieshttps://www.owasp.org/index.php/Top_10_2010-A10. The 
> vulnerability is the feature ?_next=<SITE>. One way this good be exploited 
> according to the vulnerability is a attacker gives out a link to the login 
> page of your site a uniformed user attempts to login which on success gets 
> redirected to the phishing site. On said site the attacker makes it look the 
> same and shows the form error invalid credentials the user attempts to login 
> again and gets redirected to the valid site. Now the attacker has the users 
> credentials and a way into the site. A suggested solution is on default to 
> only allow _next to redirect to a site within the application and have a 
> config file or variable which contains a whitelist of sites that are allowed 
> to be redirected to.
>
> -Eric
>
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