CVE-2026-33709
Medium
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.
SeverityMedium
CVSS6.1
Exploit probability—
ProductJupyterhub
PublishedApr 3, 2026
First seenApr 3, 2026
Weakness typeCWE-601Open redirect
How to fix
Update
- jupyter jupyterhub5.4.4 or later
- jupyterhub5.4.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| jupyter jupyterhub | v < 5.4.4 | 5.4.4 |
| jupyterhubPyPI | v < 5.4.4 | 5.4.4 |
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