CVE-2026-33709

UNKNOWN 0.0

JupyterHub has an Open Redirect Vulnerability

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

12th

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.

CWE	CWE-601
Vendor	jupyterhub
Product	jupyterhub
Published	Apr 3, 2026
Last Updated	Apr 6, 2026

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Affected Versions

jupyterhub / jupyterhub

< 5.4.4

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-3vff-hjqv-m7h8 github.com: https://github.com/jupyterhub/jupyterhub/releases/tag/5.4.4