Cross-Site Request Forgery in Webargs
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 software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | webargs | >= 5.0.0, < 5.5.3, >= 6.0.0b1, < 6.0.0b4 | 5.5.3, 6.0.0b4 |
References
- https://webargs.readthedocs.io/en/latest/changelog.html
- https://github.com/advisories/GHSA-fjq3-5pxw-4wj4
- https://nvd.nist.gov/vuln/detail/CVE-2020-7965
- https://github.com/marshmallow-code/webargs/commit/b9ee8b0aa668207a363d9fd21d967eeadb975c3e
- https://github.com/marshmallow-code/webargs
- https://github.com/pypa/advisory-database/tree/main/vulns/webargs/PYSEC-2020-156.yaml
- https://webargs.readthedocs.io/en/latest/changelog.html#b4-2020-01-28
- https://webargs.readthedocs.io/en/latest/changelog.html#id11
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-352- Platform
- Python (PyPI)
- Package
webargs- Disclosed
- 29.01.2020
- Updated
- 11.10.2026 11:20
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2020-156 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-fjq3-5pxw-4wj4 - CC BY 4.0
Vulnerability history: webargs
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 2
- First → latest
- 03.2019 01.2020
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
Disclosures per year
- 2019: 1
- 2020: 1
- 2021: 0
- 2022: 0
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 0
-
Cross-Site Request Forgery in Webargs this entry
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