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  5. CVE-2024-6844

CVE-2024-6844: Flask-CORS allows for inconsistent CORS matching

March 20, 2025 (updated May 17, 2025)

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.

References

  • github.com/advisories/GHSA-8vgw-p6qm-5gr7
  • github.com/corydolphin/flask-cors
  • github.com/corydolphin/flask-cors/blob/main/flask_cors/extension.py
  • github.com/corydolphin/flask-cors/commit/35d875319621bd129a38b2b823abf4a2f6cda536
  • huntr.com/bounties/731a6cd4-d05f-4fe6-8f5b-fe088d7b34e0
  • nvd.nist.gov/vuln/detail/CVE-2024-6844

Code Behaviors & Features

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Affected versions

All versions before 6.0.0

Fixed versions

  • 6.0.0

Solution

Upgrade to version 6.0.0 or above.

Impact 5.3 MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Learn more about CVSS

Source file

pypi/flask-cors/CVE-2024-6844.yml

Spotted a mistake? Edit the file on GitLab.

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