GHSA-fjq3-5pxw-4wj4
Cross-Site Request Forgery in Webargs
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
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.
References
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2020-7965
- https://github.com/marshmallow-code/webargs/commit/b9ee8b0aa668207a363d9fd21d967eeadb975c3e
- https://github.com/marshmallow-code/webargs
- https://github.com/pypa/advisory-database/tree/main/vulns/webargs/PYSEC-2020-156.yaml
- https://webargs.readthedocs.io/en/latest/changelog.html
- https://webargs.readthedocs.io/en/latest/changelog.html#b4-2020-01-28
- https://webargs.readthedocs.io/en/latest/changelog.html#id11