Vulnerability DatabaseCVE-2020-7965
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CVE-2020-7965
Published:January 29, 2020
Updated:May 17, 2026
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 Packages
webargs (PYTHON):
Affected version(s) >=5.0.0 <5.5.3
Fix Suggestion:
Update to version 5.5.3
webargs (PYTHON):
Affected version(s) >=6.0.0b1 <6.0.0b4
Fix Suggestion:
Update to version 6.0.0b4
Related Resources (8)
https://github.com/marshmallow-code/webargs
https://webargs.readthedocs.io/en/latest/changelog.html
https://nvd.nist.gov/vuln/detail/CVE-2020-7965
https://webargs.readthedocs.io/en/latest/changelog.html#id11
https://webargs.readthedocs.io/en/latest/changelog.html#b4-2020-01-28
https://github.com/marshmallow-code/webargs/commit/b9ee8b0aa668207a363d9fd21d967eeadb975c3e
https://github.com/pypa/advisory-database/tree/main/vulns/webargs/PYSEC-2020-156.yaml
https://github.com/advisories/GHSA-fjq3-5pxw-4wj4
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Cross-Site Request Forgery (CSRF)
CWE-352
EPSS
Base Score:
0.17