CVE-2026-33709CWE-601

JupyterHub has an Open Redirect Vulnerability

Medium · published April 3, 2026

CVSS v4.0
5.1
EPSS
0%
Percentile
22.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.1 · MEDIUM
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
EPSS
0.00304 · 22.0th percentile
Weakness
CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')
Published
2026-04-03T22:00Z
EPSS history
Timeline
  • 03 APR 22:00Z
    JupyterHub has an Open Redirect Vulnerability
    cvelistv5