CVE-2021-23401: Open Redirect in Flask-User
(updated )
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 backslashes 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.
References
- github.com/advisories/GHSA-4298-89hc-6rfv
- github.com/lingthio/Flask-User
- github.com/lingthio/Flask-User/blob/master/flask_user/user_manager__utils.py
- github.com/pypa/advisory-database/tree/main/vulns/flask-user/PYSEC-2021-337.yaml
- nvd.nist.gov/vuln/detail/CVE-2021-23401
- snyk.io/vuln/SNYK-PYTHON-FLASKUSER-1293188
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