CVE-2026-33709 MEDIUM

CVE-2026-33709: JupyterHub has an Open Redirect Vulnerability

Vendor Jupyterhub
Product jupyterhub
Weakness CWE-601 · Open redirect
Published April 3, 2026
Last update April 6, 2026
View on NVD All CVEs

CVSS base score

5.1/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction —
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 3, 2026 CVE published
April 6, 2026 Record updated