CVE-2021-23385

Advisory

All versions of flask-security are affected by CVE-2021-23385, an open redirect vulnerability: When using the get_post_logout_redirect and get_post_login_redirect functions, 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 behavior of Werkzeug is modified using 'autocorrect_location_header=False'.
Note: Flask-Security is not maintained anymore.

Affected package

Affected versions

Fixed versions

Vulnerability changelog

This vulnerability has no description

Resources

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23385
• https://security.snyk.io/vuln/SNYK-PYTHON-FLASKSECURITY-1293234
• https://github.com/mattupstate/flask-security
• https://snyk.io/blog/url-confusion-vulnerabilities/
• https://lists.debian.org/debian-lts-announce/2023/08/msg00034.html