CVE-2024-6844: flask-cors — Exploit

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.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Weakness Type (CWE)

CWE-346 CWE-346

Affected Products

Vendor	Product	Versions
flask-cors_project	flask-cors	All

References

Exploits

https://huntr.com/bounties/731a6cd4-d05f-4fe6-8f5b-fe088d7b34e0

Other References

https://lists.debian.org/debian-lts-announce/2025/05/msg00049.html

Frequently Asked Questions

What is 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. 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. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2024-6844? +

CVE-2024-6844 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-6844? +

CVE-2024-6844 affects products from flask-cors_project, specifically: flask-cors. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-6844? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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