affected:
- ecosystem_specific: {}
  package:
    ecosystem: PyPI
    name: flask-cors
    purl: pkg:pypi/flask-cors
  ranges:
  - events:
    - introduced: '0'
    - last_affected: 4.0.1
    type: ECOSYSTEM
  versions:
  - 0.0.0.dev3
  - 0.0.0.dev4
  - '1.0'
  - '1.1'
  - 1.1.1
  - 1.1.2
  - 1.1.3
  - 1.10.0
  - 1.10.1
  - 1.10.2
  - 1.10.3
  - 1.2.0
  - 1.2.1
  - 1.3.0
  - 1.3.1
  - 1.4.0
  - 1.5.0
  - 1.6.0
  - 1.6.1
  - 1.7.0
  - 1.7.1
  - 1.7.2
  - 1.7.3
  - 1.7.4
  - 1.8.0
  - 1.8.1
  - 1.9.0
  - 2.0.0
  - 2.0.0rc1
  - 2.0.1
  - 2.1.0
  - 2.1.1
  - 2.1.2
  - 2.1.3
  - 3.0.0
  - 3.0.1
  - 3.0.10
  - 3.0.2
  - 3.0.3
  - 3.0.4
  - 3.0.6
  - 3.0.7
  - 3.0.8
  - 3.0.9
  - 4.0.0
  - 4.0.0a0
  - 4.0.1
aliases:
- CVE-2024-6221
details: Withdrawn as duplicate of PYSEC-2024-71.
  A vulnerability in corydolphin/flask-cors version 4.0.1 allows the `Access-Control-Allow-Private-Network`
  CORS header to be set to true by default. This behavior can expose private network
  resources to unauthorized external access, leading to significant security risks
  such as data breaches, unauthorized access to sensitive information, and potential
  network intrusions.
id: PYSEC-2024-260
modified: '2026-07-09T14:57:00Z'
published: '2024-08-18T19:15:04.730Z'
withdrawn: '2026-07-09T14:57:00Z'
references:
- type: FIX
  url: https://github.com/corydolphin/flask-cors/commit/03aa3f8e2256437f7bad96422a747b98ab5e31bf
- type: EVIDENCE
  url: https://huntr.com/bounties/a42935fc-6f57-4818-bca4-3d528235df4d
severity:
- score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  type: CVSS_V3