CVE-2021-23385
flask-security - security update
6.1
MEDIUM
CVSS 3.1
EPSS 0.18%
Description
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.
How to fix CVE-2021-23385
To remediate CVE-2021-23385, upgrade the affected package to a fixed version below.
- —upgrade to 4.0.0-1+deb11u1 or later
- —upgrade to 1.7.5-2+deb10u1 or later
- —no fix listed
Is CVE-2021-23385 being exploited?
Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 4.0.0-1+deb11u1
- from 0, < 1.7.5-2+deb10u1
- from 0, <= 3.0.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |