CVE-2026-33709

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 v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/jupyterhub/jupyterhub/releases/tag/5.4.4	Product
https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-3vff-hjqv-m7h8	Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

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

History

22 Apr 2026, 15:59

Type	Values Removed	Values Added
First Time		Jupyter jupyterhub Jupyter
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 6.1
CPE		cpe:2.3:a:jupyter:jupyterhub::::::::
References	~~() https://github.com/jupyterhub/jupyterhub/releases/tag/5.4.4 -~~	() https://github.com/jupyterhub/jupyterhub/releases/tag/5.4.4 - Product
References	~~() https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-3vff-hjqv-m7h8 -~~	() https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-3vff-hjqv-m7h8 - Mitigation, Vendor Advisory

03 Apr 2026, 22:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-04-03 22:16

Updated : 2026-04-22 15:59

NVD link : CVE-2026-33709

Mitre link : CVE-2026-33709

CVE.ORG link : CVE-2026-33709

JSON object : View

Products Affected

jupyter

jupyterhub

CWE

CWE-601

URL Redirection to Untrusted Site ('Open Redirect')

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