CVE-2021-23393
Medium
Description
This affects the package Flask-Unchained before 0.9.0. When using the the _validate_redirect_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. 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.
SeverityMedium
CVSS5.4
Exploit probability—
ProductFlask Unchained
PublishedJun 11, 2021
First seenJun 11, 2021
How to fix
Update
- flask_unchained_project flask_unchained0.9.0 or later
- flask-unchained0.9.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| flask_unchained_project flask_unchained | v < 0.9.0 | 0.9.0 |
| flask-unchainedPyPI | v < 0.9.0 | 0.9.0 |
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