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PYSEC-2021-337

Details

This affects all versions of package Flask-User. When using the make_safe_url function, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple back slashes such as /////evil.com/path or \\\evil.com/path. 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.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/flask-user

Introduced in: 0

No fixed version published yet for flask-user (pip). Pin to a known-safe version or switch to an alternative.

References

https://snyk.io/vuln/SNYK-PYTHON-FLASKUSER-1293188[ADVISORY]
https://github.com/lingthio/Flask-User[WEB]
https://github.com/lingthio/Flask-User/blob/master/flask_user/user_manager__utils.py[WEB]
https://github.com/advisories/GHSA-4298-89hc-6rfv[ADVISORY]