id: PYSEC-2021-96
details: 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.
affected:
- package:
    name: flask-unchained
    ecosystem: PyPI
    purl: pkg:pypi/flask-unchained
  ranges:
  - type: GIT
    repo: https://github.com/briancappello/flask-unchained
    events:
    - introduced: '0'
    - fixed: 71e36b28166f9ffbe0a991f51127f0984f7e6a40
  - type: ECOSYSTEM
    events:
    - introduced: '0'
    - fixed: 0.9.0
  versions:
  - 0.1.2
  - 0.1.3
  - 0.1.4
  - 0.1.5
  - 0.1.6
  - 0.2.0
  - 0.2.1
  - 0.2.2
  - 0.3.0
  - 0.3.1
  - 0.3.2
  - 0.4.0
  - 0.4.1
  - 0.4.2
  - 0.5.0
  - 0.5.1
  - 0.6.0
  - 0.6.1
  - 0.6.2
  - 0.6.3
  - 0.6.4
  - 0.6.5
  - 0.6.6
  - 0.7.0
  - 0.7.1
  - 0.7.2
  - 0.7.3
  - 0.7.4
  - 0.7.5
  - 0.7.6
  - 0.7.7
  - 0.7.8
  - 0.7.9
  - 0.8.0
  - 0.8.1
references:
- type: ADVISORY
  url: https://snyk.io/vuln/SNYK-PYTHON-FLASKUNCHAINED-1293189
- type: FIX
  url: https://github.com/briancappello/flask-unchained/commit/71e36b28166f9ffbe0a991f51127f0984f7e6a40
- type: ADVISORY
  url: https://github.com/advisories/GHSA-pjc4-3w99-j7v4
aliases:
- CVE-2021-23393
- SNYK-PYTHON-FLASKUNCHAINED-1293189
- GHSA-pjc4-3w99-j7v4
modified: '2021-06-15T05:47:49.199835Z'
published: '2021-06-11T00:15:00Z'