CVE-2020-7965

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.

• CWE-352

• https://webargs.readthedocs.io/en/latest/changelog.htmlRelease Notes, Vendor Advisory
• https://webargs.readthedocs.io/en/latest/changelog.htmlRelease Notes, Vendor Advisory

Published

Jan 29, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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