CVSS 4.0
5.1 mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:NCVE-2026-33709
Medium (5.1) in jupyter jupyterhub. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in jupyterhub 5.4.4.
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.
Severity
CVSS 3.1
6.1 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 11% of CVEs (scores of 2026-10-31)
- CWE
- CWE-601
- Published
- Modified
- Record from
- the NVD, synced
Affected
- jupyter:jupyterhub
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-3vff-hjqv-m7h8 | PyPI | jupyterhub | <5.4.4 | 5.4.4 |
| PYSEC-2026-2188 | PyPI | jupyterhub | <5.4.4 | 5.4.4 |