Open Redirect in Flask-User Project
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.
Vulnerability class: Open Redirect
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.011 (64.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- Flask-User Project
- Flask-User — versions 0
Weakness classification (CWE)
References
- snyk.io/vuln/SNYK-PYTHON-FLASKUSER-1293188 (Third Party Advisory)
- github.com/lingthio/Flask-User (Product, Third Party Advisory)
- github.com/lingthio/Flask-User/blob/master/flask_user/user_manager__utils.py (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-23401?
- CVE-2021-23401 is a medium-severity vulnerability in Flask-User Project, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 5.4/10. Published 2021-07-05.
- How severe is CVE-2021-23401?
- Medium severity. CVSS v3 base score is 5.4 out of 10.