CVE-2020-7965 Information

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Reference

https://webargs.readthedocs.io/en/latest/changelog.html 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.

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.8