5.8
CVSSv2

CVE-2021-23393

Published: 11/06/2021 Updated: 22/06/2021
CVSS v2 Base Score: 5.8 | Impact Score: 4.9 | Exploitability Score: 8.6
CVSS v3 Base Score: 5.4 | Impact Score: 2.5 | Exploitability Score: 2.8
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:N

Vulnerability Summary

This affects the package Flask-Unchained prior to 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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flask unchained project flask unchained