A vulnerability in corydolphin/flask-cors version 4.0.1 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.
Advisories
Source ID Title
Debian DLA Debian DLA DLA-4197-1 python-flask-cors security update
EUVD EUVD EUVD-2025-6972 Flask-CORS allows for inconsistent CORS matching
Github GHSA Github GHSA GHSA-8vgw-p6qm-5gr7 Flask-CORS allows for inconsistent CORS matching
Ubuntu USN Ubuntu USN USN-7612-1 Flask-CORS vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 15 Oct 2025 13:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-840

Wed, 15 Oct 2025 13:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-346

Fri, 01 Aug 2025 01:45:00 +0000

Type Values Removed Values Added
First Time appeared Flask-cors Project
Flask-cors Project flask-cors
CPEs cpe:2.3:a:flask-cors_project:flask-cors:4.0.1:*:*:*:*:*:*:*
Vendors & Products Flask-cors Project
Flask-cors Project flask-cors

Thu, 20 Mar 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 20 Mar 2025 10:15:00 +0000

Type Values Removed Values Added
Description A vulnerability in corydolphin/flask-cors version 4.0.1 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.
Title Inconsistent CORS Matching Due to Handling of '+' in URL Path in corydolphin/flask-cors
Weaknesses CWE-840
References
Metrics cvssV3_0

{'score': 5.3, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: @huntr_ai

Published:

Updated: 2025-10-15T12:50:34.011Z

Reserved: 2024-07-17T18:28:09.292Z

Link: CVE-2024-6844

cve-icon Vulnrichment

Updated: 2025-03-20T14:26:05.664Z

cve-icon NVD

Status : Modified

Published: 2025-03-20T10:15:34.120

Modified: 2025-10-15T13:15:50.340

Link: CVE-2024-6844

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2025-07-12T22:23:33Z