# PYSEC-2018-151 - An issue was discovered in Project Jupyter JupyterHub OAuthenticator 0.6.x before 0.6.2 and 0.7.x…

Source: https://junglewise.ai/threats/pysec-2018-151-an-issue-was-discovered-in-project-jupyter-jupyterhub-20e45d8e  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2018-02-18  
License: CC BY 4.0 with a link back

Severity: low · CVSS 3.1 · Published 2018-02-18

An issue was discovered in Project Jupyter JupyterHub OAuthenticator 0.6.x before 0.6.2 and 0.7.x before 0.7.3. When using JupyterHub with GitLab group whitelisting for access control, group membership was not checked correctly, allowing members not in the whitelisted groups to create accounts on the Hub. (Users were not allowed to access other users' accounts, but could create their own accounts on the Hub linked to their GitLab account. GitLab authentication not using gitlab_group_whitelist is unaffected. No other Authenticators are affected.)

Technologies: [jupyterhub (PyPI)](https://junglewise.ai/threats/technologies/jupyterhub). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Low severity, with a CVSS score of 3.1, published 18 February 2018.

**Which products and versions are affected?** jupyterhub (PyPI) GIT:introduced=0,fixed=1845c0e4b1bff3462c91c3108c85205acd3c75a2|ECOSYSTEM:introduced=0.

**Is there a fix for This vulnerability?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected?** Check whether you run jupyterhub (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- jupyterhub (PyPI) GIT:introduced=0,fixed=1845c0e4b1bff3462c91c3108c85205acd3c75a2|ECOSYSTEM:introduced=0

## Related threats

- [JupyterHub unauthenticated denial of service in login form handling](https://junglewise.ai/threats/cve-2026-54338-jupyterhub-unauthenticated-denial-of-service-in-login-form)
- [PYSEC-2026-1480 - Cross site scripting (XSS) in JupyterHub via Self-XSS leveraged by Cookie Tossing](https://junglewise.ai/threats/cve-2024-28233-cross-site-scripting-xss-in-jupyterhub-via-self-xss-leveraged-by)
- [PYSEC-2026-647 - Open Redirect vulnerability in jupyterhub and notebook](https://junglewise.ai/threats/cve-2019-10255-open-redirect-vulnerability-in-jupyterhub-and-notebook)
- [JupyterHub XSRF protection bypass in HTTP form endpoints](https://junglewise.ai/threats/cve-2026-40864-jupyterhub-xsrf-protection-bypass-in-http-form-endpoints)
- [Jupyter JupyterHub open redirect vulnerability](https://junglewise.ai/threats/cve-2026-33709-jupyter-jupyterhub-open-redirect-vulnerability)