CVE-2024-6844
Publication date 20 March 2025
Last updated 3 July 2025
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| python-flask-cors | 25.04 plucky |
Fixed 5.0.0-1ubuntu0.1
|
| 24.04 LTS noble |
Fixed 4.0.0-1ubuntu0.1~esm1
|
|
| 22.04 LTS jammy |
Fixed 3.0.9-2ubuntu0.1
|
|
| 20.04 LTS focal |
Fixed 3.0.8-2ubuntu0.1+esm1
|
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Get Ubuntu Pro 30-day free trialSeverity score breakdown
| Parameter | Value |
|---|---|
| Base score |
5.3 · Medium
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
References
Related Ubuntu Security Notices (USN)
- USN-7612-1
- Flask-CORS vulnerabilities
- 2 July 2025