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NextFormMixin was missing validations check on redirection [1]. Only internal redirections are now allowed. Attack Example: http://127.0.0.1:5000/login?next=http://google.com (it should not redirect to google.com) wq [1] https://www.owasp.org/index.php/Top_10_2010-A10-Unvalidated_Redirects_and_Forwards