Steps to reproduce
- 1.Open example.com/login.
- 2.Open browser devtools.
- 3.Get value for
- 4.Open example.com/login in the incognito tab.
- 5.In the incognito tab, change cookie value to the one, obtained in step 3.
- 6.In the normal tab (the one from steps 1-3) log in as any user.
- 7.Refresh page in the incognito tab.
You are now logged in the incognito tab as user from step 6 as well.