GHSA-3VFF-HJQV-M7H8
Vulnerability from github – Published: 2026-04-03 21:36 – Updated: 2026-04-06 23:09
VLAI?
Summary
JupyterHub has an Open Redirect Vulnerability
Details
Affected Version
JupyterHub <= 5.4.3
Impact
An open redirect vulnerability in JupyterHub <=5.4.3 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.
Patches
Upgrade to JupyterHub 5.4.4
Workarounds
A deployment can apply filters on the Location header in a reverse proxy such as nginx/apache/traefik.
Severity ?
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 5.4.3"
},
"package": {
"ecosystem": "PyPI",
"name": "jupyterhub"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.4.4"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-33709"
],
"database_specific": {
"cwe_ids": [
"CWE-601"
],
"github_reviewed": true,
"github_reviewed_at": "2026-04-03T21:36:07Z",
"nvd_published_at": "2026-04-03T22:16:26Z",
"severity": "MODERATE"
},
"details": "## Affected Version\n\nJupyterHub \u003c= 5.4.3\n\n## Impact\n\nAn open redirect vulnerability in JupyterHub \u003c=5.4.3 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\u0027s check to prevent this.\n\n## Patches\n\nUpgrade to JupyterHub 5.4.4\n\n## Workarounds\n\nA deployment can apply filters on the Location header in a reverse proxy such as nginx/apache/traefik.",
"id": "GHSA-3vff-hjqv-m7h8",
"modified": "2026-04-06T23:09:55Z",
"published": "2026-04-03T21:36:07Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-3vff-hjqv-m7h8"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33709"
},
{
"type": "PACKAGE",
"url": "https://github.com/jupyterhub/jupyterhub"
},
{
"type": "WEB",
"url": "https://github.com/jupyterhub/jupyterhub/releases/tag/5.4.4"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "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",
"type": "CVSS_V4"
}
],
"summary": "JupyterHub has an Open Redirect Vulnerability"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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