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CVE-2024-6844

Updated on 20 Mar 2025

Severity

5.3 Medium severity

Details

CVSS score
5.3
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE ID
Links
NISTCIRCLRHELUbuntu

Overview

About vulnerability

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.

Details

Affected product:
Flask
Affected packages:
flask-cors @ 4.0.2 (+2 more)
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.