CVE-2021-23385

Open Redirect

MEDIUM 6.1EPSS 1.2%

This affects all versions of package Flask-Security. 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 behaviour of Werkzeug is modified using 'autocorrect_location_header=False. **Note:** Flask-Security is not maintained anymore.

Affected: Flask-Security
CVSS v3.1 NVD: 6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS v3.1 SNYK: 5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
EPSS: 1.25% chance of exploitation in the next 30 days, 69th percentile
Published: 2022-08-02
Updated: 2024-09-16

Proof-of-concept exploits (1)

https://security.snyk.io/vuln/SNYK-PYTHON-FLASKSECURITY-1293234

Security advisories

mattupstate/flask-security
https://snyk.io/blog/url-confusion-vulnerabilities
advisories/GHSA-cg8c-gc2j-2wf7

References

CVE Record
NVD entry