Trick to find Open Redirection

A small trick to find Open Redirection if you couldn’t find any Redirection parameters.

Steps:
1. If the Applictaion have a user Sign-In/Sign-Up feature, then register a user and log in as the user.

2. Go to your user profile page , for example : samplesite.me/accounts/profile

3. Copy the profile page’s URL

4. Logout and Clear all the cookies and go to the homepage of the site.

5. Paste the Copied Profile URL on the address bar

6. If the site prompts for a login , check the address bar , you may find the login page with a redirect parameter like the following
-https://samplesite.me/login?next=accounts/profile
-https://samplesite.me/login?retUrl=accounts/profile

7. Try to exploit the parameter by adding an external domain and load the crafted URL eg:- https://samplesite.me/login?next=https://evil.com/
(or)
https://samplesite.me/login?next=https://samplesite.me@evil.com/ #(to beat the bad regex filter)

8. If it redirects to evil.com , thers’s your open redirection bug.

9. Try to leverage it to XSS eg:- https://samplesite.me/login?next=javascript:alert(1);//