CVE-2024-6839

CVE-2024-6839 is a medium-severity vulnerability in Flask-cors Project Flask-cors with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-41.

Key facts

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.

Frequently asked questions

What is CVE-2024-6839?
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.
How severe is CVE-2024-6839?
CVE-2024-6839 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2024-6839 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-6839?
CVE-2024-6839 affects Flask-cors Project Flask-cors. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-6839?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-6839 have an EU (EUVD) identifier?
Yes. CVE-2024-6839 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-6973.
When was CVE-2024-6839 published?
CVE-2024-6839 was published on 2025-03-20 and last updated on 2026-06-17.

References

Affected products (1)

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