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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTQyOTgtODloYy02cmZ2

Open Redirect in Flask-User

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.

Permalink: https://github.com/advisories/GHSA-4298-89hc-6rfv
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTQyOTgtODloYy02cmZ2
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: over 2 years ago
Updated: 8 months ago

CVSS Score: 5.4
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Identifiers: GHSA-4298-89hc-6rfv, CVE-2021-23401
References:

• https://nvd.nist.gov/vuln/detail/CVE-2021-23401
• 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/advisories/GHSA-4298-89hc-6rfv

Repository: https://github.com/lingthio/Flask-User
Blast Radius: 10.8

Affected Packages