| Package | Affected versions | Patched versions |
|---|---|---|
| webargs | ≥ 5.0.0, < 5.5.3≥ 6.0.0b1, < 6.0.0b4 | 5.5.36.0.0b4 |
| webargs | ≥ 5.0.0, ≤ 5.5.2 |
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.
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