medium4.3
CVE-2024-6839
Flask-CORS improper regex path matching vulnerability
Impact
corydolphin/flask-cors version 5.0.1 contains an improper regex path matching vulnerability. The plugin prioritizes longer regex patterns over more specific ones when matching paths, which can lead to less restrictive CORS policies being applied to sensitive endpoints. This mismatch in regex pattern priority allows unauthorized cross-origin access to sensitive data or functionality, potentially exposing confidential information and increasing the risk of unauthorized actions by malicious actors.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | flask-cors | <= 5.0.1 | 6.0.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Flask-Cors Project | Flask-Cors | Version 4.0.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://huntr.com/bounties/403eb1fc-86f4-4820-8eba-0f3dfae9f2b4
- https://lists.debian.org/debian-lts-announce/2025/05/msg00049.html
- https://github.com/advisories/GHSA-7rxf-gvfg-47g4
- https://nvd.nist.gov/vuln/detail/CVE-2024-6839
- https://github.com/corydolphin/flask-cors/commit/e970988bea563e05e8b8f53fa7bcc134b5bf5c5f
- https://github.com/corydolphin/flask-cors/blob/4.0.1/flask_cors/core.py#L73