CVE-2024-6844: Flask-CORS allows for inconsistent CORS matching
(updated )
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.
References
- github.com/advisories/GHSA-8vgw-p6qm-5gr7
- github.com/corydolphin/flask-cors
- github.com/corydolphin/flask-cors/blob/main/flask_cors/extension.py
- github.com/corydolphin/flask-cors/commit/35d875319621bd129a38b2b823abf4a2f6cda536
- huntr.com/bounties/731a6cd4-d05f-4fe6-8f5b-fe088d7b34e0
- lists.debian.org/debian-lts-announce/2025/05/msg00049.html
- nvd.nist.gov/vuln/detail/CVE-2024-6844
Code Behaviors & Features
Detect and mitigate CVE-2024-6844 with GitLab Dependency Scanning
Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →