Open Redirect Affecting flask-user package, versions [0,]


Severity

Recommended
0.0
medium
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

Exploit Maturity
Proof of concept
EPSS
0.11% (46th percentile)

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  • Snyk IDSNYK-PYTHON-FLASKUSER-1293188
  • published30 Jun 2021
  • disclosed11 Jun 2021
  • creditNoam Moshe of Claroty

Introduced: 11 Jun 2021

CVE-2021-23401  (opens in a new tab)
CWE-601  (opens in a new tab)
First added by Snyk

How to fix?

There is no fixed version for Flask-User.

Overview

Flask-User is a Customizable User Authorization & User Management: Register, Confirm, Login, Change username/password, Forgot password and more.

Affected versions of this package are vulnerable to Open Redirect. 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`.

CVSS Scores

version 3.1