CVE-2024-6844

Inconsistent CORS Matching Due to Handling of '+' in URL Path in corydolphin/flask-cors

Published Mar 20, 2025 CVSS 3.0 · 5.3 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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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
History
Type Values Removed Values Added
Weaknesses CWE-840
Type Values Removed Values Added
Weaknesses CWE-346
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
Type Values Removed Values Added
Metrics ssvc

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

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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
@huntr_ai
Published
Updated
Nov 3, 2025, 7:34 PM
Reserved
Jul 17, 2024, 6:28 PM
Status
Modified
Published
Mar 20, 2025, 10:15 AM
Modified
Jun 17, 2026, 8:18 AM