Vulnerability Details CVE-2021-23401
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 49.8%
CVSS Severity
CVSS v3 Score 5.4
CVSS v2 Score 5.8
References
- https://github.com/lingthio/Flask-User
- https://github.com/lingthio/Flask-User/blob/master/flask_user/user_manager__utils.py
- https://snyk.io/vuln/SNYK-PYTHON-FLASKUSER-1293188
- https://github.com/lingthio/Flask-User
- https://github.com/lingthio/Flask-User/blob/master/flask_user/user_manager__utils.py
- https://snyk.io/vuln/SNYK-PYTHON-FLASKUSER-1293188
Products affected by CVE-2021-23401
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cpe:2.3:a:flask-user_project:flask-user:-
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cpe:2.3:a:flask-user_project:flask-user:0.3.5
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cpe:2.3:a:flask-user_project:flask-user:0.3.6
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cpe:2.3:a:flask-user_project:flask-user:0.4.0
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cpe:2.3:a:flask-user_project:flask-user:0.5.0
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cpe:2.3:a:flask-user_project:flask-user:0.5.1
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cpe:2.3:a:flask-user_project:flask-user:0.5.3
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cpe:2.3:a:flask-user_project:flask-user:0.6
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cpe:2.3:a:flask-user_project:flask-user:0.6.1
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cpe:2.3:a:flask-user_project:flask-user:0.6.10
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cpe:2.3:a:flask-user_project:flask-user:0.6.12
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cpe:2.3:a:flask-user_project:flask-user:0.6.13
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cpe:2.3:a:flask-user_project:flask-user:0.6.14
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cpe:2.3:a:flask-user_project:flask-user:0.6.16
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cpe:2.3:a:flask-user_project:flask-user:0.6.17
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cpe:2.3:a:flask-user_project:flask-user:0.6.19
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cpe:2.3:a:flask-user_project:flask-user:0.6.2
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cpe:2.3:a:flask-user_project:flask-user:0.6.20
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cpe:2.3:a:flask-user_project:flask-user:0.6.21
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cpe:2.3:a:flask-user_project:flask-user:0.6.3
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cpe:2.3:a:flask-user_project:flask-user:0.6.4
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cpe:2.3:a:flask-user_project:flask-user:0.6.5
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cpe:2.3:a:flask-user_project:flask-user:0.6.6
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cpe:2.3:a:flask-user_project:flask-user:0.6.7
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cpe:2.3:a:flask-user_project:flask-user:0.6.8
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cpe:2.3:a:flask-user_project:flask-user:0.6.9
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cpe:2.3:a:flask-user_project:flask-user:1.0.1.1
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cpe:2.3:a:flask-user_project:flask-user:1.0.1.2
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cpe:2.3:a:flask-user_project:flask-user:1.0.1.3
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cpe:2.3:a:flask-user_project:flask-user:1.0.1.4
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cpe:2.3:a:flask-user_project:flask-user:1.0.1.5
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cpe:2.3:a:flask-user_project:flask-user:1.0.2.0
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cpe:2.3:a:flask-user_project:flask-user:1.0.2.1
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cpe:2.3:a:flask-user_project:flask-user:1.0.2.2