CVE-2020-7965: PYSEC-2020-156 - 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

CVE-2020-7965 · Severity: low · CVSS 3.1 · Published 2020-01-29

Technologies: webargs (PyPI). Vendors: PyPI.

Executive brief

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 products

PyPI webargs

Related threats

PYSEC-2019-139 - An issue was discovered in webargs before 5.1.3, as used with marshmallow and other products. JSON parsing uses a short-lived cache to store
PYSEC-2019-69 - An issue was discovered in webargs before 5.1.3, as used with marshmallow and other products. JSON parsing uses a short-lived cache to store