CVE-2026-33709JupyterHub has an Open Redirect Vulnerability
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
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
- 5.1 MEDIUM (v4.0, CNA)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
- Weakness (CWE)
- CWE-601
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Apr 6, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
jupyterhub jupyterhub jupyterhub:jupyterhub (from the name) | before 5.4.4 | CNA record |
jupyter jupyterhub jupyter:jupyterhub | before 5.4.4 | NVD |
References
- https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-3vff-hjqv-m7h8x-refsource-confirm, mitigation, vendor-advisory
- https://github.com/jupyterhub/jupyterhub/releases/tag/5.4.4x-refsource-misc, product
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.