What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.3 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-03-20 · updated 2026-06-17
• Weakness: CWE-346

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.

Affected products

• corydolphin/flask-cors: 4.0.1

References

• https://huntr.com/bounties/731a6cd4-d05f-4fe6-8f5b-fe088d7b34e0
• https://lists.debian.org/debian-lts-announce/2025/05/msg00049.html

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