CVE-2024-6839 Improper Regex Path Matching in corydolphin/flask-cors
Improper regex matching in flask-cors allows unauthorized cross-origin access to sensitive endpoints, exposing confidential data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2024-6839?
CVE-2024-6839 is a medium-severity vulnerability in corydolphin/flask-cors, published on 20 Mar 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
corydolphin/flask-cors version 4.0.1 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.
Weakness: CWE-41
Which versions are affected by CVE-2024-6839?
3 open source packages ship an affected version, including flask-cors. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
flask-cors PyPI | All versions | 6.0.0 |
flask-cors PyPI | All versions | 6.0.0 |
flask-cors PyPI | All versions | 6.0.0 |
Products include Flask-Cors Project Flask-Cors.
How do I fix CVE-2024-6839?
Upgrade flask-cors to 6.0.0 or later.
Is CVE-2024-6839 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-6839 exists.
Other vulnerabilities in corydolphin/flask-cors
Sources
Also known as CLSA-2026-1787900734, DEBIAN-CVE-2024-6839, ECHO-ead3-0d9b-e590, GHSA-7rxf-gvfg-47g4, PYSEC-2026-1384, ROOT-APP-PYPI-CVE-2024-6839 and 1 more.