GoogleOAuthenticator.hosted_domain incorrectly verifies membership of an Google organization/workspace
Summary and impact
GoogleOAuthenticator.hosted_domain is used to restrict what Google accounts can be authorized to access a JupyterHub. The restriction is intended to ensure Google accounts are part of one or more Google organizations/workspaces verified to control specified domain(s).
The vulnerability is that the actual restriction has been to Google accounts with emails ending with the domain. Such accounts could have been created by anyone which at one time was able to read an email associated with the domain. This was described by Dylan Ayrey (@dxa4481) in this blog post from 15th December 2023.
Remediation
Upgrade to oauthenticator>=16.3.0 or restrict who can login another way, such as allowed_users or allowed_google_groups.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | oauthenticator | < 16.3.0 | 16.3.0 |
References
- https://github.com/jupyterhub/oauthenticator/security/advisories/GHSA-55m3-44xf-hg4h
- https://nvd.nist.gov/vuln/detail/CVE-2024-29033
- https://github.com/jupyterhub/oauthenticator/commit/5246b09675501b09fb6ed64022099b7644812f60
- https://github.com/jupyterhub/oauthenticator
- https://trufflesecurity.com/blog/google-oauth-is-broken-sort-of
- https://pypi.org/project/oauthenticator
- https://github.com/advisories/GHSA-55m3-44xf-hg4h
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N- Weakness (CWE)
CWE-285- Platform
- Python (PyPI)
- Package
oauthenticator- Disclosed
- 20.03.2024
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1710 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-55m3-44xf-hg4h - 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
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