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VULNERABILITIES

CVE-2026-33709 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:6.1 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/jupyterhub/jupyterhub/releases/tag/5.4.4 [email protected]Product
https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-3vff-hjqv-m7h8 [email protected]MitigationVendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-601URL Redirection to Untrusted Site ('Open Redirect')[email protected]

Affected Products

ProductVersions
jupyter jupyterhub
< 5.4.4

CPE

  • cpe:2.3:a:jupyter:jupyterhub:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

5 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-33709
NVD Published Date:
Apr 3, 2026
NVD Last Modified:
Jul 24, 2026
Source:
[email protected]
CVE-2026-33709 Details - Not Deferred