CVE-2024-6844: Inconsistent CORS Matching Due to Handling of '+' in URL Path in corydolphin/flask-cors

Published Mar 20, 2025
·
Updated

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 unquoteplus 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.

Other sources

A vulnerability in corydolphin/flask-cors version 5.0.1 allows for inconsistent CORS matching due to the handling of the '+' character in URL paths. The request.path is passed through the unquoteplus 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.

— GitHub

Affected Software

13 affected componentsFixes available
corydolphin flask-cors
pip/flask-cors<=5.0.1
6.0.0
Flask-cors Project Flask-cors=4.0.1
IBM Cognos Analytics<=11.2.0
IBM Cognos Analytics<=12.0
IBM Cognos Transformer<=12.0
IBM Cognos Transformer<=11.2.4
IBM Cognos Transformer<=12.1.0
IBM Cognos Analytics<=11.2.0
IBM Cognos Analytics<=12.1.0
IBM Cognos Analytics<=12.0
IBM Cognos Transformer<=11.2.4
IBM Cognos Transformer<=12.1.0

Event History

Mar 20, 2025
CVE Published
via MITRE·10:10 AM
Data Sourced
via MITRE·10:10 AM
DescriptionSeverityWeakness
Data Sourced
via NVD·10:15 AM
DescriptionSeverityWeakness
Data Sourced
via NVD·10:15 AM
Affected Software
Advisory Published
via GitHub·12:32 PM
May 26, 2026
Data Sourced
via IBM·05:05 PM
DescriptionAffected Software

Parent advisories

This vulnerability appears in the following advisories.

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Frequently Asked Questions

1

What is the severity of CVE-2024-6844?

CVE-2024-6844 has been classified as a moderate severity vulnerability due to potential issues with CORS matching.

2

How do I fix CVE-2024-6844?

To fix CVE-2024-6844, upgrade to version 4.0.2 or later of flask-cors where the inconsistency in CORS matching has been addressed.

3

Which software versions are affected by CVE-2024-6844?

CVE-2024-6844 affects flask-cors version 4.0.1.

4

What kind of issues does CVE-2024-6844 create?

CVE-2024-6844 creates issues with inconsistent CORS behavior that can lead to security vulnerabilities when handling requests.

5

Is there a known exploit for CVE-2024-6844?

As of now, there are no publicly known exploits for CVE-2024-6844, but it poses a risk that should not be ignored.

Company

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CVE-2024-6844 - Inconsistent CORS Matching Due to Handling of '+' in URL Path in corydolphin/flask-cors - SecAlerts