{"id":"GHSA-3vff-hjqv-m7h8","summary":"JupyterHub has an Open Redirect Vulnerability","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's 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.","aliases":["BIT-jupyterhub-2026-33709","CVE-2026-33709","PYSEC-2026-2188"],"modified":"2026-07-13T07:26:28.413653255Z","published":"2026-04-03T21:36:07Z","database_specific":{"github_reviewed":true,"github_reviewed_at":"2026-04-03T21:36:07Z","nvd_published_at":"2026-04-03T22:16:26Z","cwe_ids":["CWE-601"],"severity":"MODERATE"},"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"}],"affected":[{"package":{"name":"jupyterhub","ecosystem":"PyPI","purl":"pkg:pypi/jupyterhub"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.4"}]}],"versions":["0.1.0","0.2.0","0.3.0","0.4.0","0.4.1","0.5.0","0.6.0","0.6.1","0.7.0","0.7.0b1","0.7.1","0.7.2","0.8.0","0.8.0b1","0.8.0b2","0.8.0b3","0.8.0b4","0.8.0b5","0.8.0rc1","0.8.0rc2","0.8.1","0.9.0","0.9.0b1","0.9.0b2","0.9.0b3","0.9.0rc1","0.9.1","0.9.2","0.9.3","0.9.4","0.9.5","0.9.6","1.0.0","1.0.0b1","1.0.0b2","1.1.0","1.1.0b1","1.2.0","1.2.0b1","1.2.1","1.2.2","1.3.0","1.4.0","1.4.1","1.4.2","1.5.0","1.5.1","2.0.0","2.0.0b1","2.0.0b2","2.0.0b3","2.0.0rc1","2.0.0rc2","2.0.0rc3","2.0.0rc4","2.0.0rc5","2.0.1","2.0.2","2.1.0","2.1.1","2.2.0","2.2.1","2.2.2","2.3.0","2.3.1","3.0.0","3.0.0b1","3.1.0","3.1.1","4.0.0","4.0.0b1","4.0.0b2","4.0.1","4.0.2","4.1.0","4.1.1","4.1.2","4.1.3","4.1.4","4.1.5","4.1.6","5.0.0","5.0.0b1","5.0.0b2","5.1.0","5.2.0","5.2.1","5.3.0","5.3.0rc0","5.4.0","5.4.1","5.4.2","5.4.3"],"database_specific":{"last_known_affected_version_range":"\u003c= 5.4.3","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-3vff-hjqv-m7h8/GHSA-3vff-hjqv-m7h8.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},{"type":"CVSS_V4","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"}]}