OAuthenticator is an OAuth token library for the JupyerHub login handler. CILogonOAuthenticator is provided by the OAuthenticator package, and lets users log in to a JupyterHub via CILogon. This is pr
OAuthenticator is an OAuth token library for the JupyerHub login handler. CILogonOAuthenticator is provided by the OAuthenticator package, and lets users log in to a JupyterHub via CILogon. This is primarily used to restrict a JupyterHub only to users of a given institute. The allowed_idps configuration trait of CILogonOAuthenticator is documented to be a list of domains that indicate the institutions whose users are authorized to access this JupyterHub. This authorization is validated by ensuring that the email field provided to us by CILogon has a domain that matches one of the domains listed in allowed_idps.If allowed_idps contains berkeley.edu, you might expect only users with valid current credentials provided by University of California, Berkeley to be able to access the JupyterHub. However, CILogonOAuthenticator does not verify which provider is used by the user to login, only the email address provided. So a user can login with a GitHub account that has email set to <something>@berkeley.edu, and that will be treated exactly the same as someone logging in using the UC Berkeley official Identity Provider. The patch fixing this issue makes a breaking change in how allowed_idps is interpreted. It's no longer a list of domains, but configuration representing the EntityID of the IdPs that are allowed, picked from the list maintained by CILogon. Users are advised to upgrade.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | oauthenticator | < 15.0.0 | 15.0.0 |
References
- https://github.com/jupyterhub/oauthenticator/security/advisories/GHSA-r7v4-jwx9-wx43
- https://nvd.nist.gov/vuln/detail/CVE-2022-31027
- https://github.com/jupyterhub/oauthenticator/commit/5cd2d1816f90dc5c946e6e38fd2d0ba535624c5c
- https://github.com/jupyterhub/oauthenticator
- https://github.com/pypa/advisory-database/tree/main/vulns/oauthenticator/PYSEC-2022-206.yaml
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N- Weakness (CWE)
CWE-639- Platform
- Python (PyPI)
- Package
oauthenticator- Disclosed
- 06.06.2022
- Updated
- 11.10.2026 11:19
Sources and licenses
OSV / GitHub Advisory Database - GHSA-r7v4-jwx9-wx43 - CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2022-206 - PyPA Advisory Database; CC BY 4.0
Vulnerability history: oauthenticator
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
- 6
- First → latest
- 02.2018 04.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 5
- Medium 1
Disclosures per year
- 2018: 1
- 2019: 0
- 2020: 1
- 2021: 0
- 2022: 1
- 2023: 0
- 2024: 2
- 2025: 0
- 2026: 1
-
OAuthenticator is an OAuth token library for the JupyerHub login handler. CILogonOAuthenticator is provided by the OAuthenticator package, and lets users log in to a JupyterHub via CILogon. This is pr this entry
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