GitHub Advisoryadvisory · PyPI

GHSA-8vgw-p6qm-5gr7 Flask-CORS allows for inconsistent CORS matching

MEDIUM Published 2025-03-20 Modified 2025-11-03 Official page ↗
Aliases
CVE-2024-6844
Ecosystem
PyPI
Packages
flask-cors
Severity
Moderate
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weaknesses
CWE-346
Reviewed
2025-03-21

Affected packages

• PyPI flask-cors: < 6.0.0 → fixed in 6.0.0

Description

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.

Related

Alias · CVE (1)

  • CVE-2024-6844 A vulnerability in corydolphin/flask-cors version 4.0.1 allows for inconsistent CORS matching due to the handling of the '+' character in… vulnerability

Weakness · CWE (1)

  • CWE-346 Origin Validation Error weakness

References