flaskparser.py in Webargs 5.x through 5.5.2 doesn't check that the Content-Type header is application/json when receiving JSON input. If the request body is valid JSON, it will accept it even if the content type is application/x-www-form-urlencoded. This allows for JSON POST requests to be made across domains, leading to CSRF.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| webargs(PyPI) | 5.0.0 | 5.5.3 | N/A |
| webargs(PyPI) | 6.0.0b1 | 6.0.0b4 | N/A |
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