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Cross-Site Request Forgery in Webargs

High severity GitHub Reviewed Published Apr 7, 2021 to the GitHub Advisory Database • Updated Feb 20, 2024

Package

pip webargs (pip)

Affected versions

>= 5.0.0, < 5.5.3
>= 6.0.0b1, < 6.0.0b4

Patched versions

5.5.3
6.0.0b4

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.

References

Published by the National Vulnerability Database Jan 29, 2020
Reviewed Mar 29, 2021
Published to the GitHub Advisory Database Apr 7, 2021
Last updated Feb 20, 2024

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS score

0.073%
(33rd percentile)

Weaknesses

CVE ID

CVE-2020-7965

GHSA ID

GHSA-fjq3-5pxw-4wj4

Source code

Credits

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