Description
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.
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | webargs | >= 5.0.0, < 5.5.3 | 5.5.3 | GHSA-fjq3-5pxw-4wj4 |
| PyPI | webargs | >= 6.0.0b1, < 6.0.0b4 | 6.0.0b4 | GHSA-fjq3-5pxw-4wj4 |