VulnerabilityModified

CVE-2024-6844

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.

MEDIUM 5.3EPSS 0.31%

Does this matter?

Lower severity and a low EPSS score (0.31%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 3.0: 5.3 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS: 0.31% probability · 23th percentile
CISA KEV: Not listed
Weakness: CWE-346
Affected: flask-cors project/flask-cors
Source: security@huntr.dev

References

https://huntr.com/bounties/731a6cd4-d05f-4fe6-8f5b-fe088d7b34e0Exploit, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/05/msg00049.html

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.