CVE-2021-23393

Open Redirect

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.

References

Link	Tags
https://snyk.io/vuln/SNYK-PYTHON-FLASKUNCHAINED-1293189	third party advisory patch
https://github.com/briancappello/flask-unchained/commit/71e36b28166f9ffbe0a991f51127f0984f7e6a40	third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2021-23393?: CVE-2021-23393 has been scored as a medium severity vulnerability.
How to fix CVE-2021-23393?: To fix CVE-2021-23393, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-23393 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-23393 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-23393?: CVE-2021-23393 affects n/a Flask-Unchained.

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Description

Category

CWE-601 – URL Redirection to Untrusted Site ('Open Redirect')

References

Frequently Asked Questions