Open Redirect Affecting flask-security package, versions [0,]

  • Exploit Maturity

    Proof of concept

  • Attack Complexity


  • User Interaction


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  • snyk-id


  • published

    18 May 2021

  • disclosed

    18 May 2021

  • credit

    Noam Moshe of Claroty

How to fix?

There is no fixed version for Flask-Security.


Flask-Security is a Simple security for Flask apps.

Affected versions of this package are vulnerable to Open Redirect. When using the get_post_logout_redirect and get_post_login_redirect functions, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple back slashes such as \\\

This vulnerability is only exploitable if an alternative WSGI server other than Werkzeug is used, or the default behaviour of Werkzeug is modified using 'autocorrect_location_header=False`.

Note: Flask-Security is not maintained anymore.