id: PYSEC-2026-1385
published: "2026-07-07T14:34:54.518645Z"
modified: "2026-07-07T17:24:09.519591Z"
aliases:
- CVE-2024-6844
- GHSA-8vgw-p6qm-5gr7
summary: Flask-CORS allows for inconsistent CORS matching
details: A vulnerability in corydolphin/flask-cors version 5.0.1 allows for inconsistent CORS matching due to the handling of the '+' character in URL paths. The request.path is passed through the unquote_plus function, which converts the '+' character to a space ' '. This behavior leads to incorrect path normalization, causing potential mismatches in CORS configuration. As a result, endpoints may not be matched correctly to their CORS settings, leading to unexpected CORS policy application. This can cause unauthorized cross-origin access or block valid requests, creating security vulnerabilities and usability issues.
affected:
- package:
    name: flask-cors
    ecosystem: PyPI
    purl: pkg:pypi/flask-cors
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 6.0.0
  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
  - 4.0.2
  - 5.0.0
  - 5.0.1
references:
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2024-6844
- type: WEB
  url: https://github.com/corydolphin/flask-cors/commit/35d875319621bd129a38b2b823abf4a2f6cda536
- type: PACKAGE
  url: https://github.com/corydolphin/flask-cors
- type: WEB
  url: "https://github.com/corydolphin/flask-cors/blob/main/flask_cors/extension.py#L193"
- type: WEB
  url: https://huntr.com/bounties/731a6cd4-d05f-4fe6-8f5b-fe088d7b34e0
- type: WEB
  url: https://lists.debian.org/debian-lts-announce/2025/05/msg00049.html
- type: PACKAGE
  url: https://pypi.org/project/flask-cors
- type: ADVISORY
  url: https://github.com/advisories/GHSA-8vgw-p6qm-5gr7
severity:
- type: CVSS_V3
  score: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N