Inconsistent CORS Matching Due to Handling of '+' in URL Path in corydolphin/flask-cors
At a glance
Severity
MEDIUM 5.3
EPSS
EPSS 0.32 % · percentile 25 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
@huntr_ai
NVD status
Modified
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.
