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MEDIUM 5.3

GHSA-43qf-4rqw-9q2g

Flask-CORS vulnerable to Improper Handling of Case Sensitivity

Details

corydolphin/flask-cors version 5.0.1 contains a vulnerability where the request path matching is case-insensitive due to the use of the `try_match` function, which is originally intended for matching hosts. This results in a mismatch because paths in URLs are case-sensitive, but the regex matching treats them as case-insensitive. This misconfiguration can lead to significant security vulnerabilities, allowing unauthorized origins to access paths meant to be restricted, resulting in data exposure and potential data leaks.

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Affected packages

PyPI / flask-cors
Introduced in: 0 Fixed in: 6.0.0
Fix pip install --upgrade 'flask-cors>=6.0.0'

References