CVE-2021-23393
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-23393
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-23393.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2021-23393
- Aliases
-
- GHSA-pjc4-3w99-j7v4
- PYSEC-2021-96
- SNYK-PYTHON-FLASKUNCHAINED-1293189
- Related
- Published
- 2021-06-11T00:15:09Z
- Modified
- 2025-07-01T12:02:52.700390Z
- Severity
-
- 5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N CVSS Calculator
- Summary
- [none]
- Details
-
This affects the package Flask-Unchained before 0.9.0. When using the the validateredirecturl 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 'autocorrectlocation_header=False.
- References