CVE-2021-23393

MEDIUM Year: 2021
CVSS v3 Score
5.4
Medium
CVSS v2 Score
5.8
Medium
Weakness Type
CWE-601
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Vulnerability Description

This affects the package Flask-Unchained before 0.9.0. When using the the _validate_redirect_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. 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.

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