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    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.

    Published:Apr 3, 2026
    Last Modified:Apr 22, 2026
    EPS:Apr 3, 2026
    EPSS Score:0.00017
    CVSS Score:6.1

    Affected Products

    Vendor
    Jupyter
    Product
    Jupyterhub
    Vendor
    Jupyterhub
    Product
    Jupyterhub

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-178 Cross-Site Flashing

    Related CVEs

    CVE-2026-40864 (CVSS 5.4) — JupyterHub is software that allows users to create a multi-user server for Jupyter notebooks. In versions 4.1.…
    CVE-2024-41942 (CVSS 7.2) — JupyterHub is software that allows one to create a multi-user server for Jupyter notebooks. Prior to versions …
    CVE-2024-28233 (CVSS 8.1) — JupyterHub is an open source multi-user server for Jupyter notebooks. By tricking a user into visiting a malic…
    CVE-2021-41247 (CVSS 3.5) — JupyterHub is an open source multi-user server for Jupyter notebooks. In affected versions users who have mult…
    CVE-2020-36191 (CVSS 4.5) — JupyterHub 1.1.0 allows CSRF in the admin panel via a request that lacks an _xsrf field, as demonstrated by a …
    CVE-2019-10255 (CVSS 6.1) — An Open Redirect vulnerability for all browsers in Jupyter Notebook before 5.7.7 and some browsers (Chrome, Fi…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High