Vulnerability Description
JupyterHub is software that allows one to create a multi-user server for Jupyter notebooks. Prior to version 5.4.4, an open redirect vulnerability in JupyterHub allows attackers to construct links which, when clicked, take users to the JupyterHub login page, after which they are sent to an arbitrary attacker-controlled site outside JupyterHub instead of a JupyterHub page, bypassing JupyterHub's check to prevent this. This issue has been patched in version 5.4.4.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Jupyter | Jupyterhub | < 5.4.4 |
Related Weaknesses (CWE)
References
- https://github.com/jupyterhub/jupyterhub/releases/tag/5.4.4Product
- https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-3vff-hjqv-m7h8MitigationVendor Advisory
FAQ
What is CVE-2026-33709?
CVE-2026-33709 is a vulnerability with a CVSS score of 6.1 (MEDIUM). JupyterHub is software that allows one to create a multi-user server for Jupyter notebooks. Prior to version 5.4.4, an open redirect vulnerability in JupyterHub allows attackers to construct links whi...
How severe is CVE-2026-33709?
CVE-2026-33709 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33709?
Check the references section above for vendor advisories and patch information. Affected products include: Jupyter Jupyterhub.